Update: I think I found it, it was my NVIDIA driver (617.14). I'm on an RTX 4090, and the game kept dying silently after 8 to 40 minutes. Nothing in the RPH log, nothing in Reliability Monitor, nothing in Event Viewer, which was weird in hindsight and should have pointed me to the driver sooner. I wasted a lot of time on plugins and ASIs. Updating to 617.42 fixed it so far. It only came out today, so I couldn't have updated any sooner. I'll keep playing to be sure. Funny thing: after years on PC, the classic "just update your drivers" advice had never worked for me, and today was the first time it actually did. So if you have random crashes with no trace and you're on 617.14, try updating before touching your mods. Thanks for all the help!