I have paired my Atrix with my 3-Series BMW. It constantly drops and reconnects BT. The car will automatically try to download the phone's contacts. It appears this might be causing the problem. When I try to place a call while it is "connected" it will start the call then drop the BT connection. I start talking to the person and then it connects again but doesn't put the audio on the car speakers. After a few seconds it drops again. This is very aggravating! My HTC Inspire 4G and the many BB's I have connect and work flawlessly. Can the BT stack be modified?