Does your Sim have the fear of fire currently? That fear supposidly makes fires excessively common to the point it'll give your entire household a fear very fast.
I'd say to turn off wants and fears, then back on if you want to keep them and get rid of the fear quickly so you can cook without the house or toilet lighting on fire three times every day. Otherwise there is a good chance you could also remove a lot trait if you happen to have the cursed one, which by default shouldn't be there.