My 850 has a sun/moon roof and last night while driving around a odd sound started coming from up inside the headliner between the sun roof and the passenger door. It's sort of hard to describe, kind of sounds like a really BIG bubblebee inside a glass jar or maybe the sound a dirt bike would make 100 yards away running over some hills if you were inside a car with the windows rolled up. This went on for a few minutes until we stopped and turned the engine off. Didn't happen again when the car was restarted. The sun roof worked fine all the time this was happening. Tilted up OK and opened and closed fine. Does anyone know what could be causing this? Except, of course, for a really big bee trapped inside my headliner. My wife was in the car also and yes she heard the "bees" too.