Everytime I play in one household a sim from another household dies. It doesn't matter if it's an active household or NPC. It gives me a notification that someone has died and asks what I want to do ...
Please move your mods folder to the desktop, delete Documents > Electronic Arts > The Sims 4 > localthumbcache, repair your game and then try again on a backup of your save to see of you can duplicate the issue on a game with no mods.
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