[MegaDeKay]

I get into situations roughly that frequency where I can't interact with anything on the desktop. That's when I switch to another VT and

   systemctl --user restart plasma-plasmashell

All my apps are there where I left them and I'm back in business.

[wolvoleo]

Oh for me it happens automatically. And my OS doesn't have systemd so that wouldn't work for me. But in this case it's not needed to restart something manually anyway.