If the instructions in comment #5 don't fix the problem then please:
1. Reproduce the freeze again.
2. Wait at least 10 seconds.
3. Reboot.
4. Run this command:
journalctl -b-1 > prevboot.txt
5. Attach the resulting text file here.
If the instructions in comment #5 don't fix the problem then please:
1. Reproduce the freeze again.
2. Wait at least 10 seconds.
3. Reboot.
4. Run this command:
journalctl -b-1 > prevboot.txt
5. Attach the resulting text file here.