I have a vibration in the steering like a warped rotor when using my cruise control at highway speed. When I use the deceleration and it tries to slow the car down it vibrates. Disengage the cruise and it stops. Seems like when the cruise is slowing the car that it must be applying the brakes and it's like the rotors are warped. Less than 9,000 miles. Taking it to dealer to check out. Any thoughts? Thanks.