it has happened after various amounts of time, sometimes after a few minutes sometime up to 30 min or so, but ive only logged out of the game once or twice voluntarily. every other time it crashes. it would probably better be described as freezing. also, i verified the files on steam and now cant play more than a few minutes. its happened browsing my character, trying to go to a new location ( fast travel or warping) looking at quests, and in npc menues.