I have the hr20-700 and have hdmi going to my sony kds55a2000 for video and am using fiber optic output to my Denon avr 3802 for audio. When I change channels between the HD channels (ESPN is the worst) I get a loud buzzing noise while the hr20 attempts to bring up the picture which takes 3-5 seconds. When I talked to advanced tech support at directv, he thought the hdmi output might be creating backfeed on audio and suggested I swap to component for video. When I changed to component for video, the audio problem stayed the same and the video scrambled between channels instead of staying black like it does with hdmi. I am on my third hr20-700 and all have had the same problem with audio. I have reset the receiver and the problem persists. Does anyone have this problem or know a fix. When I turn DD off I do not get the buzzing noise but I would like to use my DD receiver.