c3700 connection issue

Same issue here. The router hooks up fine to the internet and might be good for a day or so, then loses connection and then reconnects, sometimes several times a day. We had speeds of about 10 meg and then not long after word the internet couldn't be 'throttled', we suddenly had up to 45 meg. now it's back down to 5 if we're lucky. When initially set up, connection and speed were bad and instructions were to use the reset button and after it finished booting up, disconnect power. This seemed to do the trick, but later on we would get the disconnects again. We have comcast and the firmware version on the router is several levels above what Comcast is supposed to be...not sure if this is the issue, but I will get with Comcast and see if it might be and have them trigger the version we're supposed to have. Ookla says 4 meg right now, so I'm going to power off the router and see if reboot gets the speed back up.