@Sabinebulle  Please try playing 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 that doesn't help, please run a dxdiag and attach it to your reply.
https://help.ea.com/en-us/help/pc/how-to-gather-dxdiag-information/
Separately, another user reported that switching to DirectX 9 mode helped them.  You can try it too if your system uses DX11 mode by default; the option is with the other graphics settings, in the lower-right corner.