I recently had MRV installed. My living room TV with my 4 year old DVR (HR21) has started experiencing pixellation and brief flashes on screen of the 771 searching....message. When it happened last night, I went to the bedroom TV (HR22 just installed) because I knew it was on the same channel. I played back the part of the show and there was no pixellation at the same point in the broadcast. This happens on both live viewing and recorded broadcasts. My signal strengths are fine, but a problem wouldnt show up since these are brief interruptions of the signal at random times. Am I experiencing a DVR problem or could it be a problem with the MRV install?