I have a suspicion it might be the GTX 2070... I've been having similar stability issues - crashing infrequently but usually right around the time it should be autosaving.

I had similar issues with ARK - that game doesn't like the GTX 2070 either. I had to change the settings (terrain shadows) to a specific setting in order to stop the crashes. My advice: play with the graphical settings related to lighting and see if it affects your stability (I've not found a setting that fixes it yet but I've not tried everything).