Car won't restart after shutting down on 1996 Plymouth Breeze

This is an intermittent problem therefore mechanic can't locate problem. Battery & starter are new, fuel pump/filter new. Periodically after I have shut car off and go to restart later it won't start - no crank no noise. If I try a few times and then let it sit for 10 minutes it starts up and is fine for days or months. What could possibly be causing this?

2 answers
my car is in the shop now. they said its the altinator 200.00 just for the part.
It might be the crank case sensor