Sometimes, not always, when trying to shutdown the system, it freeze in the plasma desktop, forcing me to make a forced shutdown (long pressing power button). Almost always, this happens after I left my notebook locked (with screen turned off) for sometime, like 10 minutes.

This happens since I changed from Gnome to KDE.

I look at the "journalctl -b -1" output after a hang of the system, and for me, it looks identical to that of a proper shutdown.

If you need any other information just ask. I'm not use to report problems, so maybe i'm missing some important information.