We haven't had anything set to record on this DVR for a couple weeks. I'm really leaning towards it being a problem only because we have but one cable connected. Normally the DVR would probably use the "background" tuner to record showcases, but since we effectively only have one tuner in our situation, it has no choice but to use that one. If this is the case, then the problem is that it doesn't change it back to the previous channel when it is done. Of course this is all just a guess.