As the title says, I've got an F90BT installed in my car (about a month old), love the unit, though recently it's started acting very strange, It's hard to convey via forum, here's a sound byte:
http://www.zshare.net/audio/64622534eaaf7768/
It recently started doing this, it works fine for days and days, hours on end, then out of nowhere it will start doing this. While this occurs, the unit still functions normally, you can even listen to music, however it's overpowered by that loud noise coming from the speakers, it's REALLY loud. If you reset the unit, it will come back up, load ever