My 07 Expy Limited with NAV has a dash that goes dead. Everything on the dash goes dead - lights out, radio out, A/C stops working. Cure is to pull over and turn off the truck and then back on.

Seems to be worse during very hot weather. It is a Ford problem (had this on my F250 and I was in my friend's F250 last week and it went dead). Didn't see a thread on this here. Anyone have this problem? What did the dealer do to fix?