I bought a Netgear CM1200 modem a few months back and its been performing great until a week and a half ago. I was on my phone at around 2 AM when i noticed the router lost connection for about 5 minutes every 20 ish minutes. I thought nothing of it and just went to sleep. The next morning I woke up and everything was working fine so I moved on. Yesterday it happened again in the middle of the day, I went over to the modem and router during a loss of connection event and found the modem had a blinking upstream channel light and my router had lost connection with it. I thought if I gave it some time like last time it would fix itself. This morning I woke up and went downstairs to lose my internet connection for a minute and saw the modem flashing the upstream light again. I did some research and found out how to look at the event logs of the modem but I'm relatively new to networking so I can't really understand what could be causing the errors.