Just scanned through quickly. Sorry if you have already tried this. Leave everything "as-is", except connect the projector DIRECTLY to the DVD player, bypassing the receiver. Could be a cold solder joint (bad connection) inside the receiver that "opens" with the vibration.

Shawn

Epic 80/600 + M3's + M3 Algonquins + M2 Computer + EP125
I think I'm developing an addiction.