SUMMARY
When using a secondary screen and USB-connected mouse, after disconnecting the laptop and reconnecting it, the mouse Pointer speed is reset to the default. In order to set it to the preferred setting again, you have to go into "Settings-->Input Devices-->Mouse-->Pointer Speed" every time after disconnecting/reconnecting. 

NOTE: If you are reporting a crash, please try to attach a backtrace with debug symbols.
See https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports
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STEPS TO REPRODUCE
1. Connect an external screen and mouse to your laptop with Ubuntu and KDE
2. Set the mouse pointer speed to the lowest setting in "Settings-->Input Devices-->Mouse-->Pointer Speed" 
3. Disconnect the laptop from screen and mouse
4. Reconnect the laptop to screen and mouse

OBSERVED RESULT
The mouse pointer speed has now gone back to the default speed.

EXPECTED RESULT
The mouse pointer speed is still at the lowest setting. 

SOFTWARE/OS VERSIONS
Operating System: Kubuntu 22.04
KDE Plasma Version: 5.24.6
KDE Frameworks Version: 5.92.0
Qt Version: 5.15.3
Kernel Version: 5.15.0-48-generic (64-bit)
Graphics Platform: X11

ADDITIONAL INFORMATION