Intermittent Connection & outdated firmware (Netgear C6300)

It seems Netgear sold me a cable modem/router (C6300) that can only be updated by an ISP. Of course, my ISP (Atlantic Broadband) wasn't successfully able to push through the firmware update. I'm not sure if the outdated firmware is the source of my issues. I cannot contact Netgear with support questions because I will be charged a fee just to ask for firmware update. Reading others posts, netgear wont push one through anyways. So I'm stuck with a $200 modem/router from NETGEAR that's less then a year old that cannot be updated and as of a few weeks ago has been causing me problems with connection off and on. My ISP said that my levels look great and no errors showing up for the modem on there end.

I have been having connection issues while gaming where I intermittently drop for sessions and quickly am put back in. Also this has been happening on other devices as well (cell phones, tv on wifi, ipad). Videos streamed have been sluggish and often stop to buffer/load where they used to never have to.

I was looking through my modem/router once I logged in and theres an event log tab that too me didn't look good. I'm a rookie with routers/modems so I'm not going to try and diagnose anything by looking but figured I'd mention that in case anyone that knows something about these things wants too see the logs. Below you will see the event logs:

Do I need to use a router/modem provided from my ISP so I do not waste money in the future since I cannot get the firmware updated on my current model? I'm at a loss and not sure how to handle this.

May 1 16:40:40 2017
Warning (5)
MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
May 1 16:40:40 2017
Warning (5)
MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
May 1 16:40:40 2017
Warning (5)
MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
May 1 16:40:40 2017
Warning (5)
MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
May 1 16:40:40 2017
Warning (5)
MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
May 1 16:40:40 2017
Warning (5)
MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
May 1 16:40:40 2017
Warning (5)
MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
May 1 16:40:40 2017
Warning (5)
MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
May 1 16:40:40 2017
Notice (6)
TLV-11 - unrecognized OID
May 1 16:40:40 2017
Error (4)
Improper Configuration File CVC Format
May 1 16:40:41 2017
Warning (5)
RCS Partial Service
May 1 16:47:19 2017
Warning (5)
MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
May 1 16:47:19 2017
Notice (6)
TLV-11 - unrecognized OID
May 1 16:47:19 2017
Error (4)
Improper Configuration File CVC Format
May 2 13:14:54 2017
Critical (3)
No Ranging Response received - T3 time-out
May 3 01:46:59 2017
Warning (5)
Lost MDD Timeout
May 3 08:21:09 2017
Critical (3)
No Ranging Response received - T3 time-out
May 3 17:09:01 2017
Error (4)
DHCP RENEW WARNING - Field invalid in response v4 option
May 3 20:31:13 2017
Critical (3)
No Ranging Response received - T3 time-out
May 6 12:08:23 2017
Warning (5)
MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
May 6 12:08:23 2017
Notice (6)
TLV-11 - unrecognized OID
May 6 12:08:23 2017
Error (4)
Improper Configuration File CVC Format
May 6 12:18:18 2017
Error (4)
DHCP RENEW WARNING - Field invalid in response v4 option
May 6 12:43:35 2017
Warning (5)
MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
May 6 12:43:35 2017
Notice (6)
TLV-11 - unrecognized OID
May 6 12:43:35 2017
Error (4)
Improper Configuration File CVC Format
May 7 12:38:45 2017
Critical (3)
Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out
May 7 12:39:50 2017
Warning (5)
MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
May 7 12:39:50 2017
Notice (6)
TLV-11 - unrecognized OID
May 7 12:39:50 2017
Error (4)
Improper Configuration File CVC Format
May 7 12:44:16 2017
Warning (5)
MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
May 7 12:44:16 2017
Notice (6)
TLV-11 - unrecognized OID
May 7 12:44:16 2017
Error (4)
Improper Configuration File CVC Format
May 7 12:44:28 2017
Error (4)
T6 Timeout and retries exceeded
May 7 12:44:28 2017
Critical (3)
REG RSP not received
May 7 12:44:58 2017
Warning (5)
MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
May 7 12:44:58 2017
Notice (6)
TLV-11 - unrecognized OID
May 7 12:44:58 2017
Error (4)
Improper Configuration File CVC Format
May 7 12:54:34 2017
Error (4)
DHCP RENEW WARNING - Field invalid in response v4 option
May 7 13:21:04 2017
Warning (5)
MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
May 7 13:21:04 2017
Notice (6)
TLV-11 - unrecognized OID
May 7 13:21:04 2017
Error (4)
Improper Configuration File CVC Format
May 7 13:21:16 2017
Error (4)
T6 Timeout and retries exceeded
May 7 13:21:16 2017
Critical (3)
REG RSP not received
May 7 13:21:41 2017
Warning (5)
MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
May 7 13:21:41 2017
Notice (6)
TLV-11 - unrecognized OID
May 7 13:21:41 2017
Error (4)
Improper Configuration File CVC Format