My brother and I have been wondering this as well. I've been thinking of finding a way to mount a small fan to force cool air into the empeg unit, perhaps boring some holes into the case at other places to vent the hotter air (after first trying to ascertain where the motherboard etc, are... :-). Ideally I'd take the air feed from before the aircon, as living down here in Melbourne I'm more likely to be using heating than cooling. But we'll see.
I was driving down here (from Brisbane, over two days) and had one time where I'd put an old jumper over the empeg. About an hour after that it stuttered and froze, and I pulled it out to find it very warm indeed. I placed it in a slightly better ventilated spot and it was fine thereafter. I'm assuming that's the heat protection coming into play.
Save the whales. Feed the hungry. Free the mallocs.
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Owner of Mark I empeg 00061, now better than ever - (Thanks, Rod!) - and Karma 3930000004550