Automatic Transmission Floor Shift problems of the 2011 Ford Explorer

While driving at 35 mph going straight ahead, the car suddenly shifted into reverse, causing the vehicle to skid to a stop, this locked up the front and rear wheels skidding on the pavement. There was transmission fluid on the ground when it was towed to the dealership. Also the rear view camera came on at the same time so the occupants could see the car behind them, also indicating the car was in reverse. The transmission lever/handle was still in drive. I believe this was some type of electronic malfunction, but no warning lights came on, and on the computerized vehicle check it indicated no malfunctions, temporarily the hill assist light came on but went out shortly before the car was towed. The car could not be shifted into any gear, nor move forward or backwards. The front wheels were locked and skidding as it went onto the tow truck. The rear wheels moved at this point and it is a four wheel drive vehicle.