I have a 2014 ST with sunroof. It's been pretty good about not rattling, squeaking or creaking. But have an intersring rattle now. When the sunroof glass is closed, but the sliding sunshade open, it rattles a lot. From the drivers seat it sounds like it's coming from the passenger side backseat area. Sliding the sunshade closed instantly stops it. Opening the shade starts it. Any thoughts on how to fix this? Obviously not the worst problem, but I don't have any other issues to obsess over at the moment. Thanks.