Thanks a lot for your help.
But i tried today a call and the connection headset-phone was interrupted after 6mins (it lasted a few days ago 20mins without any problem).

now i have added "Disable=Media" directly under [General] in the file (what about "Enable=Socket" which was also suggested?)
and deleted content of /var/lib/bluetooth, rebooted and re-paired it (would it have changed anything if i have killed/stopped the processes from above?).

does /etc/event.d/bluetoothd: exec /usr/sbin/bluetoothd -n -d enable bt debugging or just gives the results? and how to disable it (when it is "debugged")?

result: auto connection does still not work (as described above); phoning is still being tested.