2015 Mercedes-Benz GLA 250 engine problems

Tl* the contact owns a 2015 mercedes benz gla250. While driving approximately 15 MPH, the vehicle stalled without warning. The vehicle was towed to a dealer and repaired; however, the check engine waring light illuminated intermittently. In addition, the vehicle would not go into reverse. While the vehicle was in park, it jerked. The vehicle was taken to a dealer again where the failure was undetermined. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was unknown.

While driving and without warning, the car shifted itself into neutral and displayed the following error message: "transmission malfunction stop." I coasted to the side of the road and upon stopping, the following error message was displayed: "service required do not shift gears visit dealer." I turned the car off, restarted it, and it drove without incident. This has happened 5 different times: once on a suburban road, once in a parking garage, and three times on a city street.