You haven't mentioned what you've tried to troubleshoot, so please forgive the repeated tips.
✽ Try playing the game in "Offline" mode
-- In Origin, go to the Origin Menu and select Go Offline.
Note: It may work better if you disconnect your computer from the internet, just for temporary - to test.
✽ Turn off Origin In-Game:
Open Origin, Select Origin > Application Settings > Origin In Game tab and click the on/off switch to disable Origin In Game. - This deactivates Origin In-Game, as it has been known to cause problems with games.
✽ Repair Game:
In Origin > Games Library, right-click on Sims 4 and select Repair. - Do note this repairs the game's install files for the actual game. It does not make any changes to the saved game files. Meaning that your saved games are safe, they won't be deleted. If you'd like you can copy the Sims 4 folder to a USB key, for safe keeping.
✽ Try running Origin As Administrator - Right-click on the Origin icon on the desktop and select Run as Administrator.
✽ Disable Game DVR and Game Bar. These are known to cause issues with some games.
How to Disable Windows 10’s Game DVR and Game Bar
https://www.howtogeek.com/273180/how-to-disable-windows-10s-game-dvr-and-game-bar/More tips can be found in the post linked below:
Relieve Freezing and/or Game Lag
https://www.carls-sims-4-guide.com/forum/index.php?topic=29313.msg426179#msg426179If the above doesn't help, please ask about troubleshooting tips over at AHQ Sims 4 Tech Help Board. Give them as much detail about your computer and what you've tried to troubleshoot.
AHQ's Sims Tech Help Board:
https://answers.ea.com/t5/Technical-Issues-PC/bd-p/The-Sims-4Sign in with your EA account, click the New Topic button, up near the top of the board, to make a new post.