Having intermittent internet connection issues. Comcast does not show outages in the San Jose area. After trying the obvious things like power cycling all networking devices, I noticed the cable modem was quite hot. So I unplugged this for about 10 minutes until it cooled off. Things have been running fine since yesterday. The SB6183 is about 1 year old. Is this likely to be a defective modem, or is there something else likely to be causing problems? Recommend replacing SB6183?