After the GB update, my Atrix is unable to sustain a reliable bluetooth connection. I tried restarting the phone, resetting the phone, deleting all paired devices and adding them again. Each device (2 car systems and 3 BT headsets) pair without any problems. The problem is that during phone calls the connection becomes unstable and audio reverts back to the phone. Its happened as early as 10 seconds into the conversation, and as late as 5 minutes or so. Thank you WolfmanRobby for guiding me to the proper place to post this.