If the game generates any kind of crash report, there would be your best place to start.

Furthermore, you could always check the Windows Event Viewer and see if it has anything interesting to say.

I will say, though, that always having the latest video drivers isn't exactly a good idea; especially nVidia drivers. (Even worse is if you let software update your drivers for you.)

dudes, hes probably got motiton blur, ssao, and sunshafts on with maxing graphics. Does dude eveen have latest drivers? lets start w those.

Mods installed?

vanilla

on my PC, not online server. I'm crashing at least 1 per session.
before H&H, this wasn't an issue

then it's your machine.
1. Is your graphics card DX 11 or DX 12 capable?
2. Are your Graphics Card Drivers up to date?
3. Do you have at least 8Gb of ram?
4. Is your CPU a dual core or better?

Goto steam library right click valhiem. properties local files. validate game files. try after this