Audio problems with my XBOX 360 Slim via HDMI cables?

I recently purchased a new HDtv and have since hooked up my 360 and ps3 to it via HDMI cables. Every time I play a game where the audio gets hectic (firefights in a shooting game) and lots of sounds are going all over the place, the audio will cut for 1-2 seconds. I figured it was the HDMI cable, so i swapped it with the one i was using on my PS3. The problem persisted. I than thought if I plugged the XBOX where I had my PS3 plugged in, it would fix this problem. This did not work either. I should mention i have no audio drop problems on my PS3 or PVR box. I am wondering if it is the Xbox or the TV.