1997 Chrysler Town and Country starts and then stalls

1997 Chrysler Town and Country Two Wheel Drive Automatic 130000 miles

I have a 1997 Chrysler Town and Country with about 130000 miles on it that I've been driving for a few years. For a while now, it will start and run for about 5 seconds and then just completely stall out. When this happens none of the lights or electronics on the dash work. But it doesn't always do this. I can drive it fine for anywhere for a few days to about a month without it happening. When it won't remain started it can be that way for a short time (1/2 hour to multiple hours) and sometimes it will remain this way for multiple days. When it was toed to the dealer it started when they began testing it out so they couldn't diagnose the problem. Does anyone have any thoughts? Please please help.