Hello, since like 20 minutes, KDE Plasma Version: 5.20.5 panel (taskbar and kickoff menu, tray on the bottom of the screen) is frozen. So i want to ask what to try?
To ideally find out the cause and fix it without logging off or reboot?
Btw. there are also "notify-send" pop up windows triggered by backintime app. from the time it frozen. (i have already made sure "ps aux|grep -i backi" shows no output)
Thank you in advance.

Ctrl+Alt+F5 works to switch to terminal and Alt+F7 back to GUI. but that does not solve the panel not responding issue

UPDATE: also desktop was frozen, so i have searched KDE frozen restart and found commands that i have ran via terminal:
killall plasmashell
kstart plasmashell # failed saying "kstart: command not found" - Likely i should have used "kstart5 plasmashell" instead and following command may not be needed.
plasmashell &

last command worked to start the interface, yet i have to do Ctrl + C to get back to command prompt after executing it. I am just wondering what caused the freeze and how to prevent it.