Moonroof air deflector problem

[H2Oman]

I have an 08 with the moonroof. When it is open and I am going 35mph or more the wind deflector vibrates loudly and makes a loud buffeting noise. Has anyone else had this problem? Is there a way I can fix it? The dealer is telling me it is normal and to open the rear sliding window and it will stop (which it does up to 60mph and then it returns). Any help is appreciated.

[ColoKR]

Mine does the same thing.

[ZeroOne]

Its not your moonroof, its physics. With no other window open, your moonroof is acting the same way as if you were blowing across the top of a bottle. Because of the enormous size of the vehicle, the speed / pitch of the resonation is extremely low, so you hear each oscillation as the air tries to balance out. Crack a rear window.