I have a customer who I installed last week, called me and says that his HD reception audio goes in and out and at differing times. The picture is fine (no pixellation at all) but the sound begins to crack up and then go out. He can drop down to SD and the sound is fine. If he leaves it on HD the sound will return but go out periodically with no rhyme or reason. I visited him today and found no problem in front of me (of course) but I noticed that the audio was much louder in SD than in HD and also it seemed to be in mono on the SD channel while spread out like stereo on the HD channel. The channel used was the same (105-USA Network) for both HD & SD tests I performed. Television is 1 year old Sony 50" flat screen LCD and I set all TV settings to either normal or off mode in audio settings. I also tried different settings in the dish menu concerning Dolby and the audio with no differences in the sound levels coming in higher in SD than HD. I replaced the receiver last week (VIP722) and the new receiver was working properly when I installed it. I also re-peaked the dish therefore giving exceptional signal (well above minimums on all transponders) and replaced spliced lines with home run cable from dish to receiver/triplexer. Any thoughts???