The contact owns a 2021 Kia Sorento. The contact stated that while driving approximately 50 MPH and exiting the freeway, the vehicle failed to accelerate and decelerated. While slowing down and driving onto the shoulder a second vehicle crashed into the rear of the vehicle. During the crash the contact sustained a mild neck injury. Medical attention was sought. Additionally, the vehicle had experienced auto stop failures and the engine failed to automatically restart when the brake pedal was released. Recently the vehicle was jerking while accelerating and merging into traffic. The manufacturer was notified of the failure. The failure mileage was 40,000.