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I have Volvo V40 and when I step in my car with my bluetooth enabled already, I see on my Z3 Bluetooth connect sand then disconnect. This repeats all the time. When I then disable bluetooth, wait a while and enable bluetooth again, the problem is gone. I don't know for sure, but what I have see on my car's phone menu, although I get these disconnects on my phone , the disconnects are not noticed by my car. But again, I didn't look into that yet. Do you have similar problems?
My Xperia 10 connects OK to my Bluetooth speaker but connects and immediately disconnects to from Ford Sync system in my car. It was fine until about 7 days ago.