As of a few month ago, my fully up-to-date Mageia 7 developed a peculiar problem. From time to time (once every few days) sound would stop working. I soon worked out that reverting to an older version of .config cured the problem. After a long hunt, I've finally found that the trouble is in the file ~/.config/plasmashellrc -- the section
[ScreenConnectors]
0=DP1
occasionally spontaneously changes to
[ScreenConnectors]
0=DP1
1=:0.0
The only cure I can find is to log out, do a console login (or login as root) and modify the file, removing 1=:0.0 line. (Just modifying the file does not work and the system restores the offending line, presumably on logout.)
Any idea anybody what the root cause might be and how to stop it happening?