I have Comcast service.
One issue I have is that my basic cable box keeps loosing sound. I had to replace it multiple times before I figured out the problem.
Apparently the box will switch to Spanish Language. Why it does this, I don't know. So what happens is that some channels will be normal, but others will have no sound what so ever.
I've yet to find a channel that will actually speak in Spanish as of yet.
So, this is very annoying. In order to change the language you have to hit the Xfinity button on the remote and go through the menu there.