Ever since I purchased my XB930 my iPhone 4 (iOS5) has been having issues with the volume when streaming through Bluetooth. When I first start up the car and drive with the music streaming from my iPhone the volume is perfect and the quality is spot on. However, when I turn the car off and come back sometimes the volume is extremely low and I have to crank the volume up all the way on the head unit to get it at an audible level. When I do this the quality goes to crap and its still not even that loud compared to what its suppose to be. The only fix I have found and only sometimes works is to t