I am very frustrated. I just got a new HDTV for the bedroom. I picked up a HDTV box from the Downingtown office last weekend, had the box initialized Sunday evening. After about 1 hour, most of the channels came in but about 20 or so digital and HD channels were pixelating/tiling so severely it they were unwatchable. However, the digital and HD channels that came in were crisp and clear. For instance, Comcast Sportsnet, ESPN, ESPN2, CNN, ABC & NBC came in fine. Other HD channels as well as digital channels like FLIX, Encore, etc., were horrible. It gets worse. Now, the channels that came in fine are now all pixelating. Even the ones I can watch have artifacts moving about every few seconds. My other HDTV and box work fine. Same hookup - RG60 cable into the house with RG59 to the boxes. The only end-to-end RG60 is to my broadband modem which had a problem 2 weeks ago but is now fine. Help Comcast. What is going on??? I'm paying hard earned money for this service.