Sounds like overload/overcurrent or temp protection is kicking in. If you skip directly to that scene, without warming up the receiver by listening to the preceding part of the film, does it still do it?
Yes, I've let it sit overnight in a cold room and started it up in the morning, skipped to the same scene, and it shuts down.
Is the scene in question one that's loud and has a lot of explosions? May be causing a short if your speakers aren't wired correctly.