Bluetooth keeps dropping connection
 

I'm using my XV6700 (with cooked ROM) in my car, which has a Pioneer receiver with BlueTooth. It works, but about 1 out of 3 calls gets dropped so that half-way through the conversation, even though the car stereo is saying it's connected, the sound is only coming through the phone itself. Is there a better BlueTooth stack or whatever that is more stable under these circumstances? Or is it the radio at fault? I don't have another BT phone to pair with this thing to find out. What do people think?

Mike