This has happend 4 times in the last 4 months.  I turn the car off, run
in to the store, come out 5 minutes later, the car won't start.
Nothing, no click, nothing. All the lights on the dashboard turn on,
the radio plays, headlights, auto locks, etc. all work.  Just nothing
when I try to start it.

If I wait an extended period of time, usually more than an hour but
sometimes half a day, it starts up just fine.

I've tried moving the gear shift, steering wheel, etc.  Nothing helps
other than giving it some time.  Then it starts like there was never a
problem.

I've had to leave at a friend's house because it would not start till
the next day.

Any ideas what can be the problem??

Thanks,
Patrick