Transmission Gear Indicator problems of the 2006 Toyota Prius

The contact owns a 2006 Toyota Prius. The contact was driving approximately 30 mph on normal road conditions. There was pressure applied to the accelerator pedal, followed by an unintended increase in acceleration. The driver applied pressure to the brake pedal and the vehicle failed to slow down. The gear shift failed to operate in the "neutral" position. In addition, the entire gear indicators illuminated at the same time. The vehicle was driven into a barrier of dirt as a result of the vehicle coming to a complete stop. The failures occurred on four separate occasions. The vehicle was towed to an authorized dealer. The technician was unable to duplicate the failure. The vehicle has not been repaired for the malfunctions. The failure mileage was 41,404.