While driving the vehicle, without warning the car stopped itself simulating a "slamming on the brakes" affect. there was no warning, the car just stopped. after the car stopped, an error appeared on the screen saying "power supply failure. to avoid accident, serious injury or death do not drive. contact dealer for service." the car stopping suddenly is very dangerous, if there was another car behind me, or if i was on the freeway, i would have gotten rear ended.