I experience the HDMI handshake issue with my HR34 -> Yamaha 3010 -> Sharp 70" as well. Sound stays on for me, but video goes black. I have to power cycle the HR34 before it comes back, and often the video goes black shortly after that yet again! I have messed with cables, added a HDMI corner adapter to ensure cables aren't getting swished against the wall, added a 5V voltage injector to the HDMI cable going to the TV, wiggled things, etc. Nothing seems to solve the problem which is clearly caused by the HR34 (no other sources in my chain cause this issue). I have no idea how to resolve this
Here's one way: Remove the AVR from the video chain. I do this out of preference, as I don't have any issues with my Denon AVR. I run optical out of the TV back to the DVR. (also a Genie).