[System] Dual monitor - problem with one background picture

[Ndimensional]

Hello,
I have a two display configuration (2x 4K Display). On both screens I have a background picture centered. On the second screen KDE "forgets" from time to time - unfortunatly not consistently reproducable - the second picture and comes up after boot with the standard background.
Where to search ?

Operating System: Kubuntu 21.04
KDE Plasma Version: 5.22.5
KDE Frameworks Version: 5.86.0
Qt Version: 5.15.2
Kernel Version: 5.11.0-37-generic (64-bit)
Graphics Platform: X11

[NoWorries]

I have found that when I have dual monitor problems, they are solved by deleting the contents of the home directory hidden file .local/share/kscreen.

After reboot, the system sorts out the displays and you may have to go to System Setting>Display and Monitor to change the settings you require.

[Ndimensional]

Well, it is only the background picture, not the monitors. At least they show the same content in terms of programs, control ribbon etc. and the "forgetting" of the background picture is unfortunately not consistently...