I upgraded service with Comcast. As part of that I went to the Comcast store and waited through very slow service and exchanged my modem.
Came home and hooked it up and was receiving a signal error message that included a number. I called Comcast and told the about the error and the number. They said they couldn't help me and needed to send a technician out. Tech comes in for 5 minutes and tells me I had it on the wrong channel, that's why I was getting the signal error.
Done. I asked him if the phone service rep should have know that, and he told me yes, but they weren't very knowledgeable.
$50 bucks! Customer for over 10 years.