Hello. I am new to the Sims forum. I wanted to say that I have a similar bug to this that is really affecting my gameplay. Fires spontaneously start around my sim, and I don't know why. It doesn't matter if she is cooking a salad, getting the mail, or even if she is in the shower or sleeping. At seemingly random times, she stops everything she is doing and catches on fire. I have to keep replacing the furniture around her, and she can't get her mail, or the fire alarms in the house won't go off, and she will die. I don't know how to fix it and would love some help.
I should also mention that it only happens at home, it has the homey, good acoustics, and celebrity home lot traits without any of the lot challenges, I play on the computer, and my game is modded. I disabled all mods and cleared my cache and it keeps happening. My sim moved three times after it started happening, and it happened everywhere she called home, so it isn't the lot either. The fires don't randomly appear on the lot—only the sim lights on fire and anything in a very close radius of her.