Dont start after engine warm up

My friend Have a transport minivan w/ V6 3800 . Sometimes when the motor heat up to 200 deg dont start again till motor cool down. The code reader do not find noting related to this problem. We replace plugs, wires, coils and finally the ignition module. But the problem show up again after three weeks. I am looking for some advice to help us whit this problem. Thanks in advance.

There are references on past posts regarding this issue. LMP suggests changing the crank position sensor, as when the auto heats up it may fail.

LMP also strongly suggests changing both the ignition module AND the crank
position sensor on vehicles more than 10 years old. Hope this helps KEV

This does sound a lot like a Crank Sensor issue.. I would be very tempted to replace it..