dx11 crashes

[Stoi]

I'm playing with the DX11 version, borderless, 1080p. I started crashing about a week ago, actually, just after installing the latest Microsoft security update KB4549951. During this period, I was also experiencing major lag spikes to sometimes up to 10s. I crashed to desktop while entering a house, and got the DX11 error message. Since then, I used a VPN to help with the terrible lag I was getting, and didn't crash until today, when my VPN was off again. This time, the game froze for several seconds during Titan HM and crashed to desktop without any error message. The game was a bit laggy at this time too.
Prior to this, I can't even remember of a single crash for the game. Just to be sure, I updated my Nvidia driver to the latest version after this second crash.

I'm not saying the things I mentioned above have something to do with the crashes, just reporting what has happened for me from just before the first crash to now.