2018 Toyota Prius Prime

There has been at least 4 times that the vehicle was not responsive to acceleration (stalled for a few seconds) then picked back up. Problem has been intermittent. There is no dash indication of an issue. Because concern is intermittent I haven’t taken vehicle in. There is NO CHECK ENGINE light on. My wife experienced it once, I’ve experienced it 3 times. Once going up steep hill, once on a steady incline and the other 2 times at 50 mph on the highway. My layman’s take points to an Inverter issue in the IPM. Intelligent Power Module having a voltage issue that causes vehicle to stall.

My 2018 Toyota Prius Supreme was parked too far away from the curb in front of a house where we were invited, in a residential area in Naperville IL. I entered the car to park it properly. I had my foot on the brakes and pressed the starting button for the engine to turn on. I then put the car on reverse and suddently the car accelerated uncontollably. Went on the grass, hit the neighbor's mailbox and stopped by crashing on a tree. I was in shock but luckily not injured. Other guests were present and witnessed the incident. Police was called in and issued a report. The car was declared by Progressive Insurance Co as a total loss.

AFTER STARTING FROM A STOP AFTER THE TRAFFIC LIGHT TURNED GREEN, THE CAR IN FRONT OF ME PULLED AHEAD AS THEY ACCELERATED FASTER THAN ME. WHEN THE CAR IN FRONT OF ME WAS ABOUT 50 YARDS IN FRONT OF ME, AND I HAD REACHED ABOUT 25 MILES PER HOUR THE CAR'S COLLISION AVOIDANCE SYSTEM ENGAGED AND SLAMMED ON THE BRAKES AND BROUGHT ME TO A FULL STOP. THE CAR IN FRONT OF ME HAD NOT APPLIED THEIR BRAKES OR SLOWED AT ALL, AND THERE WERE NO VISIBLE OBSTACLES. MY CAR STOPPED SO SUDDENLY THAT I THOUGHT I HAD BEEN HIT FROM THE REAR AT HIGH SPEED UNTIL THE RED WARNING LIGHTS APPEARED ON THE DASH (AFTER THE BRAKING STARTED). THE CARS BEHIND ME ALMOST RAN INTO ME BECAUSE OF THE SUDDEN STOP.