@7hockeyThat's it! It's the photos. I had that too unfortunately.
I had to stop using them, but I seem to be okay with the photo booth from High School Years.
So the advice I got (which worked) was to delete the photos that are in a Sims inventory. I had over 30 displayed around the house too which I also deleted. I had stacks in the inventory which all had to go. I know that's really disappointing but I'd do that immediately.
I had to start again from scratch but what you could then try is to go to Manage Game and Add-ons then click the Sims 4 panel on the right hand side of the screen. See the small amount of data next to your gamertag and clear that from Console only (see attached). Then start your game up and it will do a data sync. I'd then start a fresh game without taking photos.
Let us know how you get on with it. It's disappointing that this is still an issue. It happened to me a few years ago and I've still avoided photos except for those required for work tasks and using the photo booth. Even then I would immediately clear stored ones from the inventory.