I have a 722..couple years old. I run audio through an HK AVR 330 via optical. I'm suffering intermittent but persistant audio dropouts....maybe 2-3 times an hour for just a second. This is an ongoing issue for quite some time. Any ideas? It occurs on both live mode and DVR. Also occurs if I back up live stream a few seconds an play again. also happens when i play back via my external HD. Appreciate any ides.