[I'm bumping this, because I think it got lost on the previous page]
OK... I think I may have some news for everyone.
I got my replacement HC3800 today from Mitsubishi (THANKS ART!) and here's the spiel:
1. The new projector seems to be running happily in the problematic 24Hz mode (It's only been an hour, but that is close to a record for me).
2. The new projector is serial # 00054xx. The old shutdown-prone projector is serial # 00013xx. (I'm using xx to block two digits for security. Please fill them in with your imagination.)
3. The new projector lists its software (the first line on the maintenance screen - accessed by holding up+down+menu buttons simultaneously on the projector itself) as version 3.0 and the older projector has version 1.0.
I'm hoping for the sake of all those with working units, that the software version difference is unrelated to the shutdown problem, but it seems likely that it is.
My best to all, and good luck with your projectors. I'll keep you up-to-date if I have any shutdowns, but it is looking good so far!
"What you got back home, little sister, to play your fuzzy warbles on? I bet you got, say, pitiful portable picnic players."