@Plantyl Thanks for all the info. Your dxdiag shows that a component of Microsoft's wireless LAN service is crashing repeatedly, and while I don't know whether this is related to the Sims 4 issue, it's worth installing the newest driver Asus offers for your laptop, which looks to be newer than what you have installed. (The version numbers are a bit weird, but the dates are far enough apart.) You can find it here, specifically the "Intel Wireless LAN" driver under Networking:
https://rog.asus.com/ph/laptops/rog-strix/rog-strix-g15-series/helpdesk_download/
If you're asked, choose G512LU as the BIOS version. Restart your laptop after installing the driver.
If that doesn't help, does taking your computer offline make a difference? I realize you might not want to play like that in general, but I'm curious. Have you also disabled the EA App in-game overlay and notifications? These should all be inactive while you're in offline mode anyway, but it's worth testing.
Please also let me know if the any of the values in the Task Manager's Performance tab are different when the EA App is offline vs. online. I'm curious as to whether it's using extra CPU in trying to reconnect or anything along those lines. I do know the App often keeps trying to connect even when explicitly placed in offline mode, which is a longstanding problem that's probably been on the back burner as the team puts out more urgent fires.
Finally, if you own any other EA games, please let me know whether you see the effect on those. I'm not suggesting you buy anything to test, but Apex Legends is free, and you have the free space on your SSD to accommodate it temporarily. If you don't have time to test, that's totally fine; just let me know about everything else.