If a channel comes in great on one cable box and not another, is it a signal strength problem? Channels 810 and 815 will not show a picture in my living room while coming in fine in the bedroom. These two channels, along with 811, 812, and 816, have not been coming in well lately, but all other channels seem normal. In fact, I went to watch a recorded Lost last night and it was just an hour of messed-up pixels. Is this a signal strength problem, or something else I need to be aware of? Either way, I need to get it fixed before the tournament starts! Thanks in advance.