i had one such problem. a road trip from philadelphia to st. louis. it began to happen about 2 hours into the trip. i assumed (and i still think it was the problem) that it was b/c my amp was overheating. it is mounted in the trunk of my miata. my wife and i were packing for a week long vacation in the trunk along with a 5 person tent. i pulled over once or twice to ventilate the amp, and it was very hot. when the empeg stopped playing, i simply let it sit off for about 10 minutes and it would then play for a while until it cut out again.

don't know if this could be an issue with you or not, but thought i'd mention it.

jeremy

12 gig, green...