Thanks for the bug report. I can't yet see any cause for the freezes. Next time it happens please:
1. Note the exact time and date of the freeze.
2. Reboot.
3. Run: journalctl -b-1 > prevboot.txt
4. Attach the resulting text file here along with a note telling us the exact time and date of the freeze.
5. Check /var/crash for crash files.
Thanks for the bug report. I can't yet see any cause for the freezes. Next time it happens please:
1. Note the exact time and date of the freeze.
2. Reboot.
3. Run: journalctl -b-1 > prevboot.txt
4. Attach the resulting text file here along with a note telling us the exact time and date of the freeze.
5. Check /var/crash for crash files.