If I have an external display plugged into my laptop, sleep my laptop, unplug the display, and resume my laptop, korganizer uses 100% of my cpu and becomes unresponsive. Could be related to https://invent.kde.org/plasma/layer-shell-qt/-/commit/4a439143baf75b9a00cf17a3b7a34ae9ac93c68a
I haven't seen any similar reports since almost 4 years. and version 5 is quiet old and unmaintained by now. I also don't see what we can do in korganizer about it. I'll resolve this one. if this still happens and maybe you can attach gdb to the running Kontact/Korganizer process and see where things are hanging.