I updated to sync3.4about 7months ago now my Bluetooth is messed up my phone won’t stay connected until I plug it into thumb port and when I’m playing music on it through Bluetooth I don’t have a left speaker but it works fine on the radio I have tried to reprogram it with now luck I have also did a master reset to no avail show I go down to like v3.3and they that thanks
What build of Sync 3.4 are you running?
Have you tried a master reset on the APIM?
Have you deleted the BlueTooth pairing on both the phone and Sync and then created a new pairing?