Today, July 22, 2023, my son (21 years old) was sitting in the driver's seat of our Jeep Grand Cherokee 2015 parked in a parking lot and he felt like someone punched him in the back of the head. It turned out to be the headrest (active head restraint) whacking him in the back of his head. The active head restraint pushed out and can't go back in. He was not driving, but his head and neck hurt from this spontaneous event. I called the dealership where we purchased the car and we are bringing the car to the dealership on Monday, July 24th. There were no warning lamps, messages or any other problems with the car when this happened. He was not even driving.