Just took my phone to test the BT audio reliability. It played about 15 mins without loss of connection. Signal level varied about 20% (80 - 100) but held good.
The volume was low on BT so had to wind up on ICE. Switched to Radio and almost deafened. Likely need to adjust the phone I reckon? These audio inputs should be separately controlled channels?
Mine (I think) is a Connecta 3. Its possible the problems occur with Connecta 2 and lower vers...not sure because info is just nowhere.