I have a Philips 50" Plasma that I recently purchased from Best Buy. My signal comes from a Motorola dual tuner DVR box provided by Comcast. When I switch from HD to regular channels or vice versa, the video gets all screwed up and I have to resort to either turning off the TV or switching the video source to another input momentarily then back to the cable box. Anyone have any idea what the problem is? I've heard it rumored that there is a conflict between the TV and the box but Comcast says they know nothing about it and that I should switch to component video.