I ended up making 6 support calls for this problem and went to a local Comcast office to get a new cable modem. When I brought it home it still didn’t work correctly. I called back in to Comcast in case they had to do anything for it to start working and it suddenly started working and dropped me to an internal Comcast web page for registering my cable modem.

After all of that was done we reset the cable modem and I was back out of service. The Comcast tech mentioned in passing that I had excellent downstream signal but upstream was weak and seemed to be the problem. We agreed that there could be a short somewhere and I would just wait until Friday for the tech to come to the house.

After we hung up I started thinking about anything that I could still fix to resolve this issue. I did not have a bunch of splitters so that shouldn’t be much of an issue, but I do have 1 splitter where the Comcast cable comes in to the house. I took the cable modem down to the entry point and plugged it in. It came up in less than 15 seconds. Now it looked like the problem had to be in my house but I had already checked all the cabling. So I swapped out the only splitter we have and everything is now working perfectly again.

I never knew a simple splitter could fair but the Comcast tech said that they can burn out just like anything else. Either way, mystery solved and I don’t have to wait 4 more days for the Comcast tech to come out to the house. I love connectivity.