Don't laugh. Next time the van doesn't wake up smack the dash above the instrument cluster. If everything comes alive, including the starter, you have bad solder joints on the instrument cluster circuit board. Specifically the solder joints connecting the cluster connector to the circuit board. Your symptoms are a classic sign of it. It all has to do with the CCD multyplex data bus and it's path through the instrument cluster. If that "fixes" it, we can show you how to make a permanent fix.