Please look in /var/crash for any crash files and tell us what you find.
Also, next time the freeze happens, please:
1. Wait 10 seconds.
2. Reboot.
3. Open Terminal and run:
journalctl -b-1 > prevboot.txt
and attach the resulting text file here.
Please look in /var/crash for any crash files and tell us what you find.
Also, next time the freeze happens, please:
1. Wait 10 seconds.
2. Reboot.
3. Open Terminal and run:
journalctl -b-1 > prevboot.txt
and attach the resulting text file here.