My mom's '10 has a whistle-like noise that comes and goes. It seems like it is coming from the passenger side of the front windshield. Only happens at highway speeds. It sound kind of like the sound made when you blow on a blade of grass. I searched the forums but did not find anything conclusive. She still has original glass. She is taking her 200 to the dealer to have them look at it but I was wondering if anybody knew of any known issue that might be causing this. Thanks!