I’m having exactly the same issue. I have all the updates and this has been happening since I installed the expansion packs. The thing is, EA, this has happened before on the Sims. It doesn’t matter what the characters are doing, the game randomly crashes. What’s more, the menu is really buggy and there are problems with using the phone menu, clothing menu, and inventory etc. at random times. You need to start fixing the bugs! I will not be buying the next SIMS if you can accept people spending hundreds of pounds for a buggy game.
If you’re not sure about how to fix the bugs, go and talk to Bethesda... they know how to make games that don’t bug. Their games are much larger and more complex too. It’s unacceptable in this day and age, with a system as capable as a PS4, it’s really not on.