MuseScore looses connection to BT headset when computer is reactivated

When editing a sheet I use a BT headset with my MacBook Pro mid 2015 and actual iOS,
In the settings "I/O" I have to switch from "built-in audio" to BT headset and have to quit and restart MS - sometimes not only once (?) to get the sound on the BT headset !
Now and new to me I recognized, that MS looses connection to the BT headset when MBP goes quiet and I reopen it or reactivate it from screensaver. The shown status in the settings is still "BT headset" but the sound comes from built-in speakers !
Please can you change this boring situation to modify the settings and to close and restart MS several times until sound is where it should be !

Regards LL