Dude, you can get Firefly in blu-ray? I'm so *there*.

I've been having a funny thing where the digital audio for Dolby Digital things (from DVR, PS3, etc.) occasionally cuts out for .25-1.00 sec and it's totally random (not on explosions). My stereo is a Panasonic.

But yeah, it's sure sounding like it's specifically because of the loud stuff in your case. I wonder if it's vibration from the sub making a connection problem? Are your optical cables really tight?