Our solution to this bug is quick save -> quick load when it happens.
Yeah, that’s what we’re doing, it’s just getting very time intensive, and together with the general choppiness when switching characters, summoning things (arcane weaponry, spells with persistent effects, familiars, etc) it feels like we’re losing roughly 30% of game time to constant reloading and the game locking up. Which is a shame because playing single player is a wonderful experience!
I remember similar problems in D:OS2, but not this extreme. Would be nice if split screen would get a bit more love.