See if changing your Session Restore settings might help:
1. Open System Settings:
2. Go to: Session β Desktop Session β Session Restore
3. Make sure the following is selected;
- Start with an empty session
4. Logout (or reboot if you can)
There was a fairly recent issue KDE Plasma hangs on Shutdown, Restart and Logout that might be related β the above was the workaround.
Additionally, you might wish add some swap
space at your earliest convenience. Currently you have none configured.
- Swap (Manjaro Wiki)
Regards.