I have no idea what caused it. My character was crafting at a workbench and the only abnormal things were his torso was intermittently “Warm” and it was also overencumbered. However, his carried weight was far below the limit. While crafting, both legs suddenly broke completely.
Edit: Now my mouth was just a LITTLE warm for a few minutes and my head almost dropped to 0 health. What the hell is going on?
Edit 2: I rolled back my save. Something is obviously borked. But I’m leaving this post here to inform others.