While using the adaptive cruise control, the speed of the vehicle rapids accelerates. If set to any speed less than 50, the vehicle speeds up to 56mph. If set to any speed greater than 56 but less than 86 mph, the speed of the vehicle accelerates to 86 mph. I have tested this issue over and over. I haven’t talked to the dealership yet, but plan to today. Very scary to have the vehicle accelerate for no reason and for no driver input. The acceleration is fairly abrupt. The speed ds not decline only speeds up.