iliekponiez Some of the crashes in your dxdiag point to a component of Windows that's unlikely to be corrupt considering you can use the computer at all. But given everything that can interact with that component, some of which is on the Windows side, it's worth running a couple of basic checks of your Windows system files:
- Hit Windows key-X
- Choose either “PowerShell (Administrator)” or “Windows Terminal (Administrator),” whichever option is offered
- Inside the window that appears, copy and paste “DISM.exe /Online /Cleanup-image /Restorehealth” without quotes, and enter
- The system will start validating soon. If it throws an error, please list it here
- After it reaches 100%, hit Windows key-X again
- Again, choose “PowerShell (Administrator)” or “Windows Terminal (Administrator)”
- Inside the window, copy and paste “sfc /scannow” without quotes, and enter
- Post the message you receive here
Restart your computer, hit Windows key-i, select Update & Security, and click the box to check for updates. If any install, restart again afterwards.
The other Sims 4 crashes are somewhat generic, unfortunately; there's nothing about them that points to a particular cause. Is there any pattern to the crashing other than taking the non-fairy sim into CAS? Does that sim have any custom tattoos? Can you take a different human sim into CAS?
It is also possible that having the game installed on the external drive is the issue. I don't think using an external is an issue in general because I'd be seeing more reports. But your drive may be too slow, or it or the cable or the port it's plugged into may be defective.
An easy test would be to plug the drive into a different port, if your computer has one. I would also suggest testing the drive speed. You can use Crystal Disk Mark, which is free and highly effective:
https://crystaldiskmark.org/
Let me know what you find.