I recently moved a few miles and had my Comcast cable internet activated at the new address. Never a problem before, but about once a day now the cable modem status light starts blinking - and of course there is no internet connectivity.
No amount of configuration, renew / release or power resets of my router or of the cable modem will fix it. However, disconnecting the RG 6 TV/Internet cable from the cable modem for a few seconds then screwing it back on fixes things. Sometimes it is out for about an hour and fixes itself (based on my automated ping testing from dslreports.com and the nice graph they provide)
What could this be ? Cable modem reports -12dbm incoming signal level, within spec I believe... Comcast support has been just too clueless to deal with.