This has happened twice in two months. Cold motor starts quickly and runs well. After 10 to 15 minutes of idling, motor just shuts down. Turn the ignition key to start the motor and there is nothing. No starter, no sound, nothing! Frustrated, I wait 20 minutes and then turn the ignition key and it fires right up. Strong steady water stream, no alarms go off, and I have a brand new battery. Help.