I'm new to the forum so forgive me if I don't describe this as precisely as you would like but here it goes: I have a LG 60" Plasma with an Onkyo Audyssey receiver along with an AT&T U-verse receiver, Insignia BD player and an AppleTv (2nd gen).
My problem is when I watch U-verse, I have no issues. When I watch my AppleTv, I will get intermittent picture drop out. When I watch my Blu-Ray disc player, I get even worse dropout (audio and video on both). I am running a single HDMI to the plasma tv and everything is routed through the Onkyo receiver. When I set this up about 5 months ago, I wasn't experiencing any issues. The issues seem to have ramped up over the last several months culminating in frequent dropouts I experienced this morning.
Of note, when I am watching the AppleTv, I will get very brief static lines while watching as well. I have tried to narrow down between cold start and after it's been running a while but that seems to have no effect. My wife says it's my Crapnology (lol). Thanks