Vehicle was in motion on a city street on 12/24/18 when the entire system (engine, electrical etc.) completely quit. i was near a stop light, so i stopped and restarted the engine and resumed travel. on 12//27/18 i was in motion in a parking lot and the entire system failed again. at this time no systems were operable including lighting and the vehicle did not immediately restart with the ignition key. after approximately 5 minutes the vehicle responded to the ignition key and restarted. i took the vehicle to a toyota dealership and they did a diagnostics test. no issues were found during the test and they were unable to duplicate the complete system failure. they did and audio system update and i picked the vehicle back up on 12/28/18.