Hi Ulf,
I am attaching 2 diagnostic files: No. 1 was shortly after the sound disappeared in the middle of a piece. No. 2 is immediately after I performed the procedure described above, which brought the sound back.
I hope this is useful.
Dorico Diagnostics 1.zip (523.6 KB)
Dorico Diagnostics 2.zip (529.0 KB)
Best regards,
Niels