I have my cable box and an AppleTV hooked up to HDMI inputs on a Yamaha RX-V465 (new, not the 463). The Yamaha receiver is hooked up to a Panasonic Viera TV. When I'm watching the AppleTV, Audio and Video are fine. When I'm on the HDMI input (on the Yamaha receiver) for the cable box, I get perfect video, but intermittant audio. I've swapped HDMI inputs on the Yamaha receiver and the problem stays with the cable box. I've also swapped HDMI cables between the AppleTV and the cable box, same problem. When I take the HDMI output from the cable box directly into the TV, problem goes away...perfect video and audio. So, the problem only happens with the cable box plugged into the Yamaha via HDMI. The other mystery is that this just started today after it working for several weeks.
I have the same receiver... You can try pressing the Option button and choosing Signal Info to see what audio signal the receiver sees and if that changes over time. Maybe the cable box is not outputting according to specifications... TV can live with that, but receiver maybe can't.
You can also try to connect the cable box via SPDIF cable (optical or coax) to see if it helps or not.
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