I've noticed my F90BT has developed this weird fade-in/fade-out behavior where momentarily I loose sound, and then get it back. I haven't yet figured out the regularity but I think it may be the head unit as I hear this irrespective of whether I am listen to the radio, HD/Satellite etc.

Anyone experienced this?

Kinda odd mine just started doing this lastnight and it's only a week old. I agree about it being the head unit.