I've never had an issue with the hans free bluetooth in my car. Since I went to 9.1, I can push my Home button to make a call, Siri answers through the bluetooth in my car, I tell Siri who to call, it makes the call but then after a few seconds automatically, and on its own, switches from the handsfree bluetooth to the iPhone as the audio source. I've never seen it do that before. I have to manually reselect hands free to get it to go back through the car's bluetooth. Is there a setting I don't know about that was changed?