It's the 805 that has the issue, I had the same exact thing happen with me, what is happening is that the HDMI port on the 805 is slowly failing and soon it won't work at all. Mine did the same exact thing with Blurays, but played games just fine. I finally had to unhook my sat box HDMI and use optical from the Sat so that I could get lossless audio out of the two remaining working HDMI ports.
I actually sent my 805 to Colorado to get fixed (amp wouldnt power on under warranty and had them upgrade the firmware and fix that HDMI port, but the same port went bad about two months after getting it back and having to ship that beast back just want worth the effort.