Tried searching for this and saw reference to it in one thread but nothing conclusive... unsure of what exactly to search for because it's such a weird problem to describe. When I drive on the highway with my windows open, the rear seat belt(s) flap against the seats rapidly, making a terrible sound. I've tried buckling and unbuckling them, but neither makes a big difference. It seems to be the center one that is the biggest offender. If it matters I have the light grey Next Gen seats in the refreshed S. I'll rarely/never have anyone in the center seat, but I can't seem to come up with a way to easily solve this one. I considered taping the seat belt down, but aside from how horrible that'd probably look I don't want to deal with sun-baked tape residue a few years down the road. I don't really want to keep the rear seats folded down since occasionally people will be back there. Are you experiencing this and, if so, what have you done?