JeanVW Does the camera stutter no matter how you move it? For example, you could use the arrows on your keyboard, or edge scrolling, or you could right-click to recenter the camera (maybe Sims 3 camera mode only, not sure since that's all I use).
It's also worth trying to play in a clean boot, just to make sure no other background process is interfering.
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.
Your new dxdiag doesn't list any Windows errors either, which is not a surprise considering the Reliability Monitor shows nothing. Malwarebytes wouldn't delete this data, so it has to be something else. But we can put that aside for now if you prefer—there's a reasonable chance that this issue wouldn't be producing an error anyway even if the more generic errors were showing up properly.