This is a very specific bug symptom so please only post here if you see all of the below in your game.
There are many similar issues, so this should be kept to this issue only.
This can either b...
Ideas
I've also been having this issue and have spoken to other players who are experiencing this too. I've reset the sims in my household, moved lots, reset the sims, performed a game fix etc and it still does it. happens to mine between 4 to 6am and the only fix is to save my game but that takes forever and makes it almost unplayable.