Is There A Way to Fix A Sim That's Corrupted? (And, No, I'm Not Talking About Morally Bankrupt)

You might want to delete your cache, cachestr, and localthumbcache.package files and then run a game repair just to clean things up and make the game run a little smoother. To run a repair close the game and go into Origin and right click on the Sims 4 then choose repair.