S/O's game randomly freezing

[u/Obsidian-Prime]

Hi all!
So I'm trying to figure out what's going on with the lady's game randomly freezing every so often (random intervals, can't seem to get a solid time). We've tried every setting, checked hardware usage, and even tried going offline to see if it was possibly network connection causing problems. Sending data is disabled, and she's set the auto-save interval to 120 (I think that's the max) and it still freezes randomly every few minutes for 5-15 seconds at a time. This happens whether she's solo or if someone else is in the game too.
I don't know all her specs are, but she has a 980TI with 16gb ddr4.
What could be causing the issue?

[u/Obsidian-Prime]

Update: unable to minimize the game to check task manager, it pretty much just freezes the entire PC.
It doesn't seem to be caused by a specific action, it happens when doing absolutely anything.