If you did a full memtest and it came out good then OK.
I’m just saying don’t discount hardware issues. Bad RAM blocks are notoriously hard to diagnose by use alone because there’s not just one symptom you can point at, and they can manifest themselves wildly differently on different apps and different OS depending how large the blocks are and how they are spread.
Luckily there’s a very simple and straightforward test you can make to put it out of your mind.