2000 GMC, 60,000miles, while driving the van turns off. It will restart. It can work great for a day or even weeks with no problems and all of the sudden turns off while driving. It will turn off several times during the drive.I noticed that when the van is turned off the radio will too and unless the door is opened it should stay on for at least ten minutes after the van is turned off. It was taken to the dealer service shop and its been almost 2 days and they still cant figure it out. : Idea: what could possibly be wrong?