I've been having some problems with only two channels in my Comcast lineup...HBO 2 and Sho Too (Showtime 2). Both are SD channels and I'm having no problems that I know of with any HD or any other SD channels. Basically I'm getting pixelation and audio drops every 5-10 seconds on both channels. It makes them unwatchable. Thankfully we don't watch either very often but it is still aggravating. Comcast has come out twice, done line tests, and even brought out one of their own DVRs to test. Both channels worked perfectly on their DVRs. They said our signal is about as good as it gets. It's very strong both inside and outside the house. The CableCards are working perfectly otherwise and I get all the channels I'm supposed to get. It's just those two channels that we're having problems with, though I haven't checked every single channel in our lineup. Any suggestions?