I'm in Korvanjund on the Jagged Crown quest, and my character has started freezing up randomly.

By 'freezing', I mean: my character will suddenly stop, sheathe weapons and then just stand frozen in the idle pose. I can't use inventory/magic/favourites menus, I can't move or draw my weapons. I can use the quest menu and move the camera.

The other NPCs on the quest continue to move, and fight enemies, but enemies ignore me completely (even if I was fighting one when it happened).

This is the first time this has ever happened, and I've been using this character and set of mods for a while. The first time it happened I had been playing for an hour or so, but when I load a save it happens shortly after loading (almost immediately to a few minutes).

Any ideas? The wiki pages for this area and quest don't list it as a known bug. Is there a console code I could use to reset myself?