Parked the car with a fully warmed engine. Returned to start the car 3 hours later and it cranked well but would not start. Returned the following morning and it started perfectly. Drove the car and again parked it with a warm engine and then tried to restart it once every hour for 3 hours. It started each time without problem. My first suspicion was the thermal time switch, but it did not repeat the problem. The car was not subjected to any unusual bumps or extreme driving prior to the occurrence. Any suggestions out there?