Friend of mine owns a newer 2012 GT, he had a similar issue.
What we did (and worked) was deleting the connection on the iPhone, (dunno which iPhone your using or if its jailbroken, but I do believe all of them have the "forget" button which deletes the Bluetooth Profile that the car/iphone designated.
that initially worked for a day, but It happened again upon reconnected a few times, so we disconnected the battery for 2 hours.
That solved it for sure, we think it was something to do with the bluetooth getting shut off prematurely (shutting off the car) while the iphone was still playing music (streaming it)
If that doesn't work then take it to the dealer, it could be more serious than just a bluetooth connection issue.
Last edited by Nickrick2641; Jan 14, 2012 at 03:18 PM.