Comcast high speed

We have about a 3 year old comcast high speed modem connected to a Cisco wireless router/firewall. Every time we change something or replace a computer it is a pain to get it to work again. Router is no problem but the modem is.
I have to call comcast and get them to reset everything. The 2nd computer we added in the livingroom will all the sudden stop working and we have to disconnect then reconnect to the wireless connection to get it back. Sometimes every 5 minutes other times it will run fine all evening. Adding a 3rd computer and expecting more problems. Any thoughts?
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More about comcast high speed
  1. If you are sure it is the modem, you can try replacing the modem.
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