Alright then. That probably eliminates the lp thing. Can I ask: what journalctl command (or logging command in general, if not journalctl) did you use? I'd recommend giving the results of journalctl -b -1 -p 3 and dmesg.

Also, it'd probably be a good idea to tell us what ports are getting blocked; that shouldn't be personally identifying in any way. After doing research on what those ports are and what ProtonVPN requires, try experimenting with unblocking some of them if you can; a blocked port shouldn't crash your system, but it's worth a shot.

I might also recommend looking at a task manager, just to make sure some application isn't taking up all your memory and causing the system to freeze.

Finally, take a look at your CPU temps in case this is some kind of cooling failure.