You might consider hooking up the Blu-Ray player directly to the television and running the audio to the receiver via optical cable. It may be an issue with the handshake between the Blu-Ray player and the Yamaha.
I have a new BD-P1500 player. When watching any movie (Blu-ray or DVD) after about 5 minutes, the audio/video cuts off for about 1-3 seconds and continues to cut off intermitently throughout the entire movie. I have upgraded the firmware to the latest version and have had the home theatre installation folks out. The problem persists, even though I returned the player and got another one. Running all through HDMI cables, which I have switched around, problem still there. I am running player through a Yamaha RX-V663 receiver.
Anyone else experiencing this problem, or can offer a solution?