I'm getting the exact same error and symptoms. I've tried multiple, existing households and as well as creating a new household. I did not move any of the households to San Sequoia as I don't have that expansion.
Another symptom is the executable appears to consume more and more memory (over 12 GB in my case) up to the point is crashes.
Game has been smooth as silk prior to this point.
Thanks
@HandyFeet Please test in a clean user folder. Move the entire Sims 4 folder out of Documents > Electronic Arts and onto your desktop, and when you launch the game, a clean folder will spawn with no content. (Your saves and other content will be intact in the folder you moved but temporarily not read by the game.) Don't add anything to the new folder yet; just start a new save and see whether you have the same issue with RAM use.
If you do see that same issue, let me know what was happening in-game at the time, as I described in my other post here. If the new save is fine, copy one of your existing saves to the new user folder, but nothing else, and test that too. I'd like to see a screenshot of the Task Manager when you start to notice problems, as in my previous post, as well. And please also run a dxdiag and attach it to a post, for reference.
https://help.ea.com/en-us/help/pc/how-to-gather-dxdiag-information/
