Alright, so I put all my sims into different households and through trial and error i figured out which sim is causing the trouble. She's an elder sim (was an adult when it happened first). She has the following traits: childish, neat and genius (she got these upon aging up), plus outgoing, cheerful and glutton and the bonus trait good manners (got those through gameplay), as well as the traits always welcome, great kisser and carefree (which i purchased from the reward store).
She only has one day to live anyway. I will try the gallery method and I will post an update.
