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Problem with my Comcast Modem

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January 14, 2013 3:35:49 PM

Hello,

The past few months I've been having issues with my ComCast High Speed Internet.

I have a device that is a modem and wireless router 2 in 1 and almost every day at random times thru out the day it will disconnect and then reconnect and go back to normal like nothing happend. Some time it will do this twice in a row. Some times it will do it only once and then won't do it again till later.

I've been trying to figure out what it going on, and my only guesses would be that the Router/Modem it'self it faulty or myself the cable wire is bad, but again I'm not certain.

I was wondering what you guys think or suggest.. If you need anymore Info please let me know and I'll post it for you.

Thanks!!

More about : problem comcast modem

January 14, 2013 5:28:10 PM

If you are losing the wired Internet connection (not just the wireless), regular but randomly timed Internet loss is most commonly an ISP issue in my experience.

I would focus on that and call Comcast to check the line -- they can come out and measure your signal strength and may be able to improve it if you specifically ask them about that and they may be able to recommend (or provide) a signal amplifier if the signal is suboptimal. Is your cable split before the cable modem?

If you can borrow another router briefly from a friend, I would try it for a short time to confirm the problem is upstream from your router.
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January 14, 2013 8:15:43 PM

Nekoboy said:
Hello,

The past few months I've been having issues with my ComCast High Speed Internet.

I have a device that is a modem and wireless router 2 in 1 and almost every day at random times thru out the day it will disconnect and then reconnect and go back to normal like nothing happend. Some time it will do this twice in a row. Some times it will do it only once and then won't do it again till later.

I've been trying to figure out what it going on, and my only guesses would be that the Router/Modem it'self it faulty or myself the cable wire is bad, but again I'm not certain.

I was wondering what you guys think or suggest.. If you need anymore Info please let me know and I'll post it for you.

Thanks!!


10.0.0.1
admin
password
skip the wizard if it pops up
left side click connection, then xfinity Network
scroll down to cable modem and paste in the downstream and upstream stats

Then left side troubleshooting -> logs
system logs, last week - > show
cop\y and paste anything there in as well.

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Related resources
January 14, 2013 9:04:29 PM

wacabletech said:
10.0.0.1
admin
password
skip the wizard if it pops up
left side click connection, then xfinity Network
scroll down to cable modem and paste in the downstream and upstream stats

Then left side troubleshooting -> logs
system logs, last week - > show
cop\y and paste anything there in as well.




This is what I got:

Upstream Channel Bonding Value
Channel ID: 1 2 3 4
Frequency: 27.90 MHz 22.60 MHz --- ---
Symbol Rate: 5120 Ksym/sec 2560 Ksym/sec --- ---
Power Level: 44.25 dBmV 43.25 dBmV --- ---
Modulation: 64QAM 16QAM --- ---
Ranging Status: Success Success --- ---


Downstream Channel Bonding Value
Channel ID: 1 2 3 4
Frequency: 597.00 MHz 543.00 MHz 549.00 MHz 555.00 MHz
SNR: 34.93 dB 36.17 dB 36.84 dB 35.97 dB
Power: 2.92 dBmV 3.23 dBmV 3.06 dBmV 3.13 dBmV
Modulation: 256QAM 256QAM 256QAM 256QAM




This is the week log from Troubleshooting. (LONG post)

dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 16:43:35, 2013-01-14 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 16:38:32, 2013-01-14 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 16:18:14, 2013-01-14 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 14:19:48, 2013-01-14 System Logs
dhcpd: DHCP server received REQUEST from 00:18:61:0B:0A:1F, 12:08:39, 2013-01-14 System Logs
dhcpd: DHCP server started, 12:08:07, 2013-01-14 System Logs
dhcpd: DHCP server stopped, 12:08:00, 2013-01-14 System Logs
dhcpd: DHCP server received REQUEST from 00:A0:96:62:D 0:3E, 09:38:06, 2013-01-14 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 09:18:59, 2013-01-14 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 23:06:00, 2013-01-13 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 21:09:48, 2013-01-13 System Logs
dhcpd: DHCP server started, 20:58:04, 2013-01-13 System Logs
dhcpd: DHCP server stopped, 20:57:58, 2013-01-13 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 20:01:55, 2013-01-13 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 19:09:06, 2013-01-13 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 18:12:30, 2013-01-13 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 16:51:32, 2013-01-13 System Logs
dhcpd: DHCP server received REQUEST from 90:2B:34:1C:E2:4C, 15:50:51, 2013-01-13 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 15:10:25, 2013-01-13 System Logs
dhcpd: DHCP server started, 14:35:43, 2013-01-13 System Logs
dhcpd: DHCP server stopped, 14:35:36, 2013-01-13 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 13:32:57, 2013-01-13 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 13:08:41, 2013-01-13 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 11:14:22, 2013-01-13 System Logs
dhcpd: DHCP server received REQUEST from 90:2B:34:1C:E2:4C, 05:52:11, 2013-01-13 System Logs
dhcpd: DHCP server received REQUEST from 90:2B:34:1C:E2:4C, 05:52:11, 2013-01-13 System Logs
dhcpd: DHCP server received REQUEST from 00:18:61:0B:0A:1F, 04:16:22, 2013-01-13 System Logs
dhcpd: DHCP server started, 04:16:15, 2013-01-13 System Logs
dhcpd: DHCP server stopped, 04:16:07, 2013-01-13 System Logs
dhcpd: DHCP server started, 19:46:20, 2013-01-12 System Logs
dhcpd: DHCP server stopped, 19:46:14, 2013-01-12 System Logs
dhcpd: DHCP server started, 19:33:53, 2013-01-12 System Logs
dhcpd: DHCP server stopped, 19:33:47, 2013-01-12 System Logs
dhcpd: DHCP server received REQUEST from 90:2B:34:1C:E2:4C, 18:18:19, 2013-01-12 System Logs
dhcpd: DHCP server received REQUEST from 00:A0:96:62:D 0:3E, 16:00:57, 2013-01-12 System Logs
dhcpd: DHCP server received REQUEST from 90:2B:34:1C:E2:4C, 11:51:08, 2013-01-12 System Logs
dhcpd: DHCP server received REQUEST from 90:2B:34:1C:E2:4C, 11:14:13, 2013-01-12 System Logs
dhcpd: DHCP server received REQUEST from 00:A0:96:62:D 0:3E, 10:01:57, 2013-01-12 System Logs
dhcpd: DHCP server received REQUEST from 90:2B:34:1C:E2:4C, 09:50:28, 2013-01-12 System Logs
dhcpd: DHCP server received REQUEST from 00:18:61:0B:0A:1F, 07:39:02, 2013-01-12 System Logs
dhcpd: DHCP server started, 07:39:01, 2013-01-12 System Logs
dhcpd: DHCP server stopped, 07:38:53, 2013-01-12 System Logs
dhcpd: DHCP server received REQUEST from D4:85:64:CF:49:33, 07:38:18, 2013-01-12 System Logs
dhcpd: DHCP server received REQUEST from 00:A0:96:62:D 0:3E, 00:08:40, 2013-01-12 System Logs
dhcpd: DHCP server received REQUEST from 90:2B:34:1C:E2:4C, 17:19:53, 2013-01-11 System Logs
dhcpd: DHCP server received REQUEST from 00:A0:96:62:D 0:3E, 11:17:55, 2013-01-11 System Logs
dhcpd: DHCP server started, 09:17:11, 2013-01-11 System Logs
dhcpd: DHCP server stopped, 09:17:04, 2013-01-11 System Logs
dhcpd: DHCP server received REQUEST from 00:A0:96:62:D 0:3E, 08:14:53, 2013-01-11 System Logs
dhcpd: DHCP server received REQUEST from 90:2B:34:1C:E2:4C, 08:03:52, 2013-01-11 System Logs
dhcpd: DHCP server received REQUEST from 00:18:61:0B:0A:1F, 08:02:23, 2013-01-11 System Logs
dhcpd: DHCP server started, 06:16:41, 2013-01-11 System Logs
dhcpd: DHCP server stopped, 06:16:34, 2013-01-11 System Logs
dhcpd: DHCP server started, 05:55:11, 2013-01-11 System Logs
dhcpd: DHCP server received REQUEST from 00:A0:96:62:D 0:3E, 03:31:04, 2013-01-11 System Logs
dhcpd: DHCP server received REQUEST from 90:2B:34:1C:E2:4C, 21:38:31, 2013-01-10 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 13:44:01, 2013-01-10 System Logs
dhcpd: DHCP server started, 13:02:49, 2013-01-10 System Logs
dhcpd: DHCP server stopped, 13:02:42, 2013-01-10 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 12:48:34, 2013-01-10 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 11:01:53, 2013-01-10 System Logs
dhcpd: DHCP server received REQUEST from 90:2B:34:1C:E2:4C, 10:28:20, 2013-01-10 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 09:30:47, 2013-01-10 System Logs
dhcpd: DHCP server received REQUEST from 90:2B:34:1C:E2:4C, 08:28:42, 2013-01-10 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 04:24:39, 2013-01-10 System Logs
dhcpd: DHCP server received REQUEST from 90:2B:34:1C:E2:4C, 00:54:48, 2013-01-10 System Logs
dhcpd: DHCP server received REQUEST from 90:2B:34:1C:E2:4C, 00:54:48, 2013-01-10 System Logs
dhcpd: DHCP server received REQUEST from 00:A0:96:62:D 0:3E, 00:52:36, 2013-01-10 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 00:47:51, 2013-01-10 System Logs
dhcpd: DHCP server received REQUEST from 00:A0:96:62:D 0:3E, 00:47:32, 2013-01-10 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 19:35:14, 2013-01-09 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 19:14:59, 2013-01-09 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 18:20:23, 2013-01-09 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 17:23:24, 2013-01-09 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 16:28:38, 2013-01-09 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 15:28:06, 2013-01-09 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 14:34:41, 2013-01-09 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 13:25:04, 2013-01-09 System Logs
dhcpd: DHCP server received REQUEST from F0:A2:25:89:B6:8C, 12:57:02, 2013-01-09 System Logs
dhcpd: DHCP server received REQUEST from 90:2B:34:1C:E2:4C, 12:56:28, 2013-01-09 System Logs
dhcpd: DHCP server received REQUEST from F0:A2:25:89:B6:8C, 12:53:52, 2013-01-09 System Logs
dhcpd: DHCP server received REQUEST from F0:A2:25:89:B6:8C, 12:32:14, 2013-01-09 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 12:12:54, 2013-01-09 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 08:50:01, 2013-01-09 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 07:54:09, 2013-01-09 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 07:06:08, 2013-01-09 System Logs
dhcpd: DHCP server received REQUEST from 00:A0:96:62:D 0:3E, 06:48:12, 2013-01-09 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 06:45:21, 2013-01-09 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 06:04:23, 2013-01-09 System Logs
dhcpd: DHCP server received REQUEST from 00:A0:96:62:D 0:3E, 01:52:41, 2013-01-09 System Logs
dhcpd: DHCP server received REQUEST from 00:A0:96:62:D 0:3E, 01:52:41, 2013-01-09 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 01:38:52, 2013-01-09 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 01:04:47, 2013-01-09 System Logs
dhcpd: DHCP server started, 00:49:31, 2013-01-09 System Logs
dhcpd: DHCP server stopped, 00:49:24, 2013-01-09 System Logs
dhcpd: DHCP server received REQUEST from 90:2B:34:1C:E2:4C, 00:46:48, 2013-01-09 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 00:45:25, 2013-01-09 System Logs
dhcpd: DHCP server received REQUEST from 00:A0:96:62:D 0:3E, 00:13:11, 2013-01-09 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 00:12:28, 2013-01-09 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 21:48:55, 2013-01-08 System Logs
dhcpd: DHCP server started, 21:45:55, 2013-01-08 System Logs
dhcpd: DHCP server stopped, 21:45:48, 2013-01-08 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 20:04:03, 2013-01-08 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 19:36:39, 2013-01-08 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 18:55:32, 2013-01-08 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 18:24:21, 2013-01-08 System Logs
dhcpd: DHCP server received REQUEST from 90:2B:34:1C:E2:4C, 17:22:34, 2013-01-08 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 17:16:39, 2013-01-08 System Logs
dhcpd: DHCP server received REQUEST from 00:16:CF:1A:0B:18, 14:28:56, 2013-01-08 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 13:56:26, 2013-01-08 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 12:59:19, 2013-01-08 System Logs
dhcpd: DHCP server received REQUEST from 00:18:61:0B:0A:1F, 12:20:40, 2013-01-08 System Logs
dhcpd: DHCP server started, 12:20:24, 2013-01-08 System Logs
dhcpd: DHCP server stopped, 12:20:16, 2013-01-08 System Logs
dhcpd: DHCP server received REQUEST from 00:16:CF:1A:0B:18, 12:20:06, 2013-01-08 System Logs
dhcpd: DHCP server received REQUEST from 00:18:61:0B:0A:1F, 12:20:00, 2013-01-08 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 12:19:58, 2013-01-08 System Logs
dhcpd: DHCP server received REQUEST from D4:85:64:CF:49:33, 12:19:49, 2013-01-08 System Logs
dhcpd: DHCP server received REQUEST from 00:18:61:0B:0A:1F, 12:19:44, 2013-01-08 System Logs
dhcpd: DHCP server received REQUEST from 90:2B:34:1C:E2:4C, 11:40:08, 2013-01-08 System Logs
dhcpd: DHCP server started, 11:34:48, 2013-01-08 System Logs
dhcpd: DHCP server stopped, 11:34:41, 2013-01-08 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 11:32:15, 2013-01-08 System Logs
dhcpd: DHCP server started, 10:57:35, 2013-01-08 System Logs
dhcpd: DHCP server stopped, 10:57:29, 2013-01-08 System Logs
dhcpd: DHCP server received REQUEST from 88:25:2C:65:6B:20, 10:43:20, 2013-01-08 System Logs
dhcpd: DHCP server started, 10:22:56, 2013-01-08 System Logs
dhcpd: DHCP server stopped, 10:22:49, 2013-01-08 System Logs
dhcpd: DHCP server received REQUEST from D4:85:64:CF:49:33, 09:45:46, 2013-01-08 System Logs
dhcpd: DHCP server received REQUEST from 90:2B:34:1C:E2:4C, 07:53:56, 2013-01-08 System Logs
dhcpd: DHCP server received REQUEST from 00:16:CF:1A:0B:18, 07:52:20, 2013-01-08 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 07:42:29, 2013-01-08 System Logs
dhcpd: DHCP server received REQUEST from 90:2B:34:1C:E2:4C, 23:46:48, 2013-01-07 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 23:44:44, 2013-01-07 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 22:58:35, 2013-01-07 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 21:29:47, 2013-01-07 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 20:03:59, 2013-01-07 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 17:48:04, 2013-01-07 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 17:13:50, 2013-01-07 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 15:49:10, 2013-01-07 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 14:27:08, 2013-01-07 System Logs
dhcpd: DHCP server received REQUEST from 00:A0:96:62:D 0:3E, 12:52:35, 2013-01-07 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 12:42:22, 2013-01-07 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 11:49:24, 2013-01-07 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 09:34:22, 2013-01-07 System Logs
dhcpd: DHCP server received REQUEST from 90:2B:34:1C:E2:4C, 09:29:00, 2013-01-07 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 02:42:40, 2013-01-07 System Logs
dhcpd: DHCP server received REQUEST from 9C:D 2:4B:BA:A5:D 7, 02:42:40, 2013-01-07 System Logs
dhcpd: DHCP server received REQUEST from 00:A0:96:62:D 0:3E, 02:35:29, 2013-01-07 System Logs
dhcpd: DHCP server received REQUEST from 90:2B:34:1C:E2:4C, 02:12:29, 2013-01-07 System Logs
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January 15, 2013 2:25:50 PM

You can trim that log now if you do not mind, first few entries are enough. That's ridiculous for a week btw I have 0 entries in mine for the last month. Signal levels look OK other than the 34 SNR on the downstream freq 597 Mhz, its not a huge issue mind you, but I'd want to know why its there if I were installing that device.

My recommendation at this time, would be to swap out the Dory with another one.

T3/T4 errors should be present if there was a cable signal issue and there are none, just DHCP stop/start/requests which indicates either the modem is faulty or someone fudged up the cmts config.

Swapping the modem is the easiest first attempt at a fix.
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Best solution

January 15, 2013 3:29:44 PM

Not the most likely issue, but I have seen my Comcast modem drop connection / pick back up sporadically before I put it on a small UPS. Not a single problem since. Mind you I mean small, and old UPS. I refurbed an old CyberPower CP585AVR that actually took about 10 years to kill the original battery... Just swap that battery out, verify function and put it to use on the modem / router / switch for the network and ALL my disconnect problems went away... Not saying you need to recycle an oldie, but it is a cheap way to get it smoothed out if you have one handy, if not, the small AVR units aren't that expensive, and well worth the investment!
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January 15, 2013 5:49:08 PM

Thanks for the replies, but could you translate that to noob speak? :p  I'm clueless about Networking things.

What I think I'm getting from this is to call COmcast and get my modem replace and someone to come check the line. RighT?
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January 15, 2013 6:39:27 PM

Nekoboy said:
Hello,

The past few months I've been having issues with my ComCast High Speed Internet.

I have a device that is a modem and wireless router 2 in 1 and almost every day at random times thru out the day it will disconnect and then reconnect and go back to normal like nothing happend. Some time it will do this twice in a row. Some times it will do it only once and then won't do it again till later.

I've been trying to figure out what it going on, and my only guesses would be that the Router/Modem it'self it faulty or myself the cable wire is bad, but again I'm not certain.

I was wondering what you guys think or suggest.. If you need anymore Info please let me know and I'll post it for you.

Thanks!!


I am not sure what you mean, disconnects, and reconnects. Do you mean to the cable? To the WiFi, or to perhaps a not mentioned wired ethernet connection? Does everything disconnect at once? Is it frequent and regular like a scheduled job, or is it random?

Since this is Comcast equipment, I would start by calling them for support on their stuff. But there are some things you can do to help them out...

#1. Make sure your power isn't the problem. A small UPS with AVR (Automatic Voltage Regulation) will be invaluable for insuring the modem / router / switching are stable, or at least not unstable due to power problems. 600va units can be had for around $70.00...
#2. Make sure your coax connectors aren't loose...
#3. If you have a wired ethernet connection, make certain it isn't loose.
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January 16, 2013 1:05:43 PM

Nekoboy said:
Thanks for the replies, but could you translate that to noob speak? :p  I'm clueless about Networking things.

What I think I'm getting from this is to call Comcast and get my modem replace and someone to come check the line. RighT?


2 things, first just swap the modem, you can have them mail you one, deliver one, or pick one up at a cable store, your call there.

There may be an issue on the cable signals, not sure the 34 downstream SNR is a concern again its not a HERE I AM FIX ME thing, just a, SNR should be 35-36 with the levels provided. And the cause could be anything from a loose fitting not screwed down correctly or solid polycore poorly shielded wires [often purchased at retail markets the country over], to a misaligned laser in the fiber optics down the road. the most likley and probably cause is the wiring in your house is not correctly down its either has a loose fitting or its old wiring you should have replaced. It could also just be the way the modem reads the signal and a new modem might read it different.
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January 17, 2013 1:28:29 AM

wacabletech said:
2 things, first just swap the modem, you can have them mail you one, deliver one, or pick one up at a cable store, your call there.

There may be an issue on the cable signals, not sure the 34 downstream SNR is a concern again its not a HERE I AM FIX ME thing, just a, SNR should be 35-36 with the levels provided. And the cause could be anything from a loose fitting not screwed down correctly or solid polycore poorly shielded wires [often purchased at retail markets the country over], to a misaligned laser in the fiber optics down the road. the most likley and probably cause is the wiring in your house is not correctly down its either has a loose fitting or its old wiring you should have replaced. It could also just be the way the modem reads the signal and a new modem might read it different.



Thanks for the advice, I'm going to try out a new modem and see how that works. By the way, I'm pretty sure it wouldn't be the wiring cause when the guy came to install our cable internet he used fresh wire from his truck and went up and attatched it to the light pole on the corner of the street to the side of our house and down into the room where the modem is, so it's all fresh wiring so I don't see how that could be the issue if it truly is.. *shrugs*

anyway thanks for the advice!
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February 5, 2013 6:09:22 PM

Nekoboy said:
Thanks for the advice, I'm going to try out a new modem and see how that works. By the way, I'm pretty sure it wouldn't be the wiring cause when the guy came to install our cable internet he used fresh wire from his truck and went up and attatched it to the light pole on the corner of the street to the side of our house and down into the room where the modem is, so it's all fresh wiring so I don't see how that could be the issue if it truly is.. *shrugs*

anyway thanks for the advice!


Don't be so certain it can't be the coax. The installers usually make fresh cable using bulk cable and either screw on, or crimp on coax ends. If not installed 100% correctly, and weather sealed, they can lose contact, cause degraded signal, so if say a strong wind blows just right, it will break connection, and reset once it comes back together... Same thing if the conductor in the coax is flawed...
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July 18, 2013 9:33:08 AM

I've been having this exact same issues for the past week. Since they had installed service at my house I have had disconnect issues over and over and over for 10 minutes at a time where the upstream and downstream on the modem go orange then the modem completely disconnects and is like its rebooting. I replaced the modem and it is still happening, I was looking through the thread but it doesn't look like there was a solution posted so once the technician fixes it I will repost just in case we have others that happen to find this thread.
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February 2, 2014 11:12:56 AM

See if you can see a wifi network called xfinity or xfinitywifi. If so, Comcast may be using your device to host it. Call them an opt out to have them remove this network from your gateway. This worked for me.
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May 15, 2014 12:53:31 PM

DatGeeGee said:
I was looking through the thread but it doesn't look like there was a solution posted so once the technician fixes it I will repost just in case we have others that happen to find this thread.


Did you ever get this resolved? I am having hae same issues here. Thanks!
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July 25, 2014 11:22:43 PM

I was told this weekend by the Comcast tech that the 2 in 1 router/modem is not that great and that I may need to reinstall my Linksys router . He told me he could not lie to his customers and that most techs are told not to tell the customers. I reinstalled my Linksys and NO issues!

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!