That kind of looks like how a machine would look if the RAM is loose in the socket or otherwise have a bad contact. And since you mention that it's random and sometimes there are no vertical lines, that'd be my guess rather than anything to do with graphical software. Is the RAM on your machine soldered on or is it detachable? If it's the latter, I recommend taking the RAM out and reseating it to see if things improve (try this a couple of times, just to be sure the RAM is properly seated). If the RAM is soldered on then it might have something to do with out of memory. Does the system slow down a couple of seconds before freezing entirely? If it does then it's likely it's a OOM thing.

Oh, and for good measure, can you get to the tty (ctrl + alt + f2) when the system freezes? If you can then it's probably a graphical thing and you can try restarting those processes. If the system is in a complete freeze then I'd say that's another point for the OOM hypothesis.

probably, why didn't you install it through the package manager?

my deepest condolences... also don't they re-open public registration on Nov 20? https://shitposter.club/notice/Aa34W1BLFyy3RuBB5M

basically an agreement between 14 countries to share signals intelligence amongst one another. effectively, if your data gets captured in Sweden, all the participating states are able to get their hands on it. check out the Wikipedia article for more details on 14 eyes: https://en.wikipedia.org/wiki/Five_Eyes#Fourteen_Eyes

not to discredit what they do and what's been said, but i think it's important to keep in mind (with one's threat model in mind also) that they're based in Sweden, a 14 eyes country.