Bluetooth 3.0 Troubles even with 2.12

After turning the sandisk player on again the previously already esatblished bluetooth connection which is still displayed on the player seems somehow invalid as no music is played.

It is necessarry to turn the bluetooth functionality repeatedly on and off on the player and after a few searches and many connection fails the connection magically works again. This procedure takes at least 5 minutes every time.

I even bought a second player to rule out hardware defects but the behaviour is the same.

The device I am connecting to is a AEG MC 4469 which supports Bluetooth v3.0 and it works 100% fine with tested with my cellular.

I would appreciate any help but in my opinion another firmware update is required which fixes further bluetooth issues.