I, too, am having problems with the GSII losing or corrupting its bluetooth credentials with my 2010 Kia Soul Exclaim. And the problem is with the phone, not the car audio system.
About once a week the phone and car audio refuse to connect. The only fix is to delete the phone's profile from the car, delete the car's profile from the phone, then re-pair the two.
I'm positive that it's not a problem with the car audio system. My Galaxy S (AT&T Captivate), iPhone 4, and Motorola Atrix all work fine.
I'm hoping that the pending upgrade to Android 4.0.x will address the issue. If not, I'll root the phone and replace the BT stack with something a bit more car-audiio friendly.
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