SIMS 4 crashing/ unplayable

ancko​  I apologize for the late reply; I've been away from the forums for a while and am only now catching up with old threads.

If you'd still like to troubleshoot this issue, I would suggest doing a clean uninstall and reinstall of Sims 4, and playing in a clean boot, in that order.  Clean-uninstalling is covered in the accepted solution of this thread about a different issue:

[CURRENT ISSUE] Sims 4 DLC shows as installed, won't load in-game | EA Forums - 11831673

Anchors don't work on this site at the moment, so search for revo to jump to the relevant section.

Here's how to play in a clean boot:

https://support.microsoft.com/en-us/topic/how-to-perform-a-clean-boot-in-windows-da2f9573-6eec-00ad-2f8a-a97a1807f3dd

The one service to leave enabled is the EABackgroundService, which the EA App needs in order to run.  Disable the rest as described.

When you reboot your computer, go through the Task Manager's background processes list shutting down any service that doesn't absolutely need to be running, for example anything from MSI Afterburner to RGB software might still be enabled.  If you accidentally kill a critical process and it doesn't restart on its own, just reboot your computer again.

Don't open anything other than Sims 4 and the EA App while testing, not even a browser window.

If this helps, you can selectively reenable services until you find the culprit, then either leave that disabled or (if it belongs to an app you want to keep using) let me know what it is so we can try to fix the underlying issue.