Additional information that can be helpfull to solve the problem:
The list of Artist in ‘My Artist’ is not my list and it differ from time to time.
The list of Albums in ‘My Albums’ is not mine and it differ form time to time.
The problem is here since af few weeks/a (two) month. I did not add any new artist and albums to my libary since the problem is showing up (hoping the problem will dissapear again ;-( )
Some playlist are shorter (albums and tracks are lost) and some not
Are they playlists you’ve created in Qobuz, or in Roon directly? Can you be a bit more specific around the issues you’re having with them? If youre missing tracks, can you use the playlist improver button at the top of the playlist to find+replace the missing tracks?