Transmission Slip Out Of Gear problems of the 2009 Toyota Prius

Driving vehicle on a city street in drive gear and it slipped out of drive into neutral without warning. Tried to put it back in drive (as I was on the road) but every time I switched gears back to drive and released the gear shifter it would immediately pop back into neutral. I parked & turned the car off, waited and then turned it back on again. It seemed to be okay so I got on the freeway home and after I merged into traffic the same problem happened (but while I was driving at a much faster speed). I had to hold the gear shift down in drive the entire ride home (with my one year old in the car). I got home and after I parked and let the car sit I went back out and tried the car again and it happened again. I checked and the same problem happened in reverse (it won't stay in reverse, it just pops back into neutral).

The contact owns a 2009 Toyota Prius. The contact stated that while driving at 35 mph, the vehicle shifted out of gear and stalled. The vehicle could be restarted. The vehicle was towed to the dealer, who could not duplicate the failure. The vehicle was not repaired. The manufacturer was made aware of the failure. The approximate failure mileage was 66,000. The VIN was not available.