Bluetooth connectivity issue in BMW

Hi all! My boss has the Edge + (as do I) and is having all sorts of issues with the bluetooth connectivity in his BMW. It keeps dropping in and out. The calls don't drop; the bluetooth drops and then reconnects. He's a business owner and makes tons of calls from his car, so as you can imagine, this is quite frustrating (and embarrassing).

Anyone else having similar issues?????

Appreciate your help.