During this month, it freezes so often. I could only move the mouse, the cursor moved but could not click.
I had to switch off and on every time.
What could be the problem ?
After swithed off and on:
Have you tried a peek at the logs? Something like:
sudo journalctl --since "30 minutes ago"
Run this right after you force a reboot. Hopefully you’ll get a clue of what is hanging the machine.