Hatchback/liftgate problems of the 2013 Lexus RX350

The contact owns a 2013 Lexus Rx350. The contact stated that after closing the liftgate door and reversing out of the car port, the liftgate door erroneously opened and struck the car port causing damage to the liftgate. The local dealer and manufacturer were notified of the failure. The cause of the failure was not yet determined. The contact stated that recently the liftgate lowered independently. The failure occurred several times while placing items into the back of the vehicle. The cause of the failure was not yet determined. The manufacturer was notified of the failure but no assistance was provided. The failure mileage was 40,000.