Regarding the audio system freezing... I have had this happen a couple of times to me as well. However, as you said, turning the radio off, and then on again, sorted the problem out.
Regarding the bluetooth issue... My experience is that it is specific to the phone. My wife's old Samsung E900 had the same sort of issue. It would sometimes bond and then sometimes disconnect. However, my phone (Samsung G800) and her new phone (Samsung F480) work perfectly. I find that the Ford Audio system automatically connects to my phone within a few seconds of starting the car and reliably stays connected.
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