JadeCookies12
Which exact model Mac do you have? Apple > About This Mac
Do you think it's happening at specific points during gameplay such as travelling, multiple Sims on the Lot, in CAS, when your Sim carries out a specific action, at a specific time of day ? Or completely randomly?
Can you test a completely clean game and see if it still happens -
[INSTRUCTIONS] How to troubleshoot and test a broken game | EA Forums - 11864548
Don't copy over any of your saves or any other user data, start with a completely clean TS4 folder and new save.