MaddieW58 Thanks for the dxdiag. Please force the game to run in DirectX 11 mode. Open the EA App, select Sims 4 > Manage > View properties, and add -dx11 to the command line box.
If that alone doesn't help, disable Game Mode and Game Bar, both under Windows Settings > Gaming.
DailySlychosis Please create your own thread listing all the issues you're seeing. Please provide a dxdiag as well. Click Windows key-R, enter dxdiag in the run box, wait for the scan to finish, click "Save all information," and save the file to your desktop. From there, you can attach it to a reply using the paper clip (Attachment) icon included with the other formatting buttons.