man journalctl:
"
-b:
while -0 is the last boot, -1 the boot before last, and so on.
Just in case, -p:
- "emerg" (0),
- "alert" (1),
- "crit" (2),
- "err" (3),
- "warning" (4),
- "notice" (5),
- "info" (6),
- "debug" (7)
Possible related ("The issue is: it freezes randomly."):
https://discussion.fedoraproject.org/t/fedora-31-intel-bay-trail/68658
Your can see also:
“https://discussion.fedoraproject.org/search?q=freezes”
PS: If your have enough RAM?
PSPS: What is your computer hardware?