Type 3.1:  D3D device being Lost 

1. Sometimes restarting the device or game can solve the issue
   
   
   

2. Windows/Driver Updates

3. Right-click on “Windows PowerShell” in the search results. From the context menu that appears, select “Run as administrator.”

4. Copy this block into Powershell script: ⁠
   
   
   

5. install-packageprovider -name "nuget" -force
   install-module pswindowsupdate -force
   set-executionpolicy -scope currentuser -executionpolicy unrestricted -force
   import-module pswindowsupdate
   get-windowsupdate -install -microsoftupdate -acceptall

6. 
   

7. Check for GPU Driver updates on the GPU manufacturer's website

8. Follow the troubleshooting here: https://www.followchain.org/the-ue4-client-game-wuthering-waves/

9. Clear Patches or if you can't access Rover Screen, delete Saved Folder in the Client Folder
   
   
   

10. MPO issue: https://nvidia.custhelp.com/app/answers/detail/a_id/5157/~/after-updating-to-nvidia-game-ready-driver-461.09-or-newer%2C-some-desktop-apps

11. Follow the troubleshooting here: https://www.dragonflydb.io/error-solutions/unreal-engine-error-0x887a0020

12. Underclock you GPU using MSI Afterburner: https://www.makeuseof.com/how-underclock-gpu/ 

13. Reinstall your Drivers: 

    1. Go here: https://www.guru3d.com/download/display-driver-uninstaller-download/

    2. Download Display Driver Uninstaller. 

    3. Run it and completely uninstall the drivers

    4. Check the section in Additional Sources on "How to install Studio/PRO drivers" or Click HERE and find the same

Additional Info:

• (IMPORTANT) The Powershell script downloads all cumulative updates provided by Microsoft and their associated drivers. This is to ensure that no lack of updated software is the cause for the error.

• Stress test suggestion for GPU in step 6 of https://www.dragonflydb.io/error-solutions/unreal-engine-error-0x887a0020 : (Probably not the cause if every other app works, can be skipped) https://www.xda-developers.com/how-to-stress-test-gpu/

• Always monitor your stuff with MSI Afterburner. If your GPU (or anything, really) reaches uncomfortable temperatures (90°C+) despite being within the spec requirements then either the game optimization, graphic settings or your hardware is the issue.

• If you can't access the website in ⁠official-links , download link here: https://download.kurogames.net/transfer/mc_WnGtDn85y8lJB4mTmYHYuNjIl9n6YGVm/official/global/en/pc_app

• Kuro Customer support usually doesn't answer Performance/Bug reports, so don't expect an answer. Wait for a game hotfix to solve the issue.

Additional sources:
https://learn.microsoft.com/en-us/nuget/what-is-nuget (regarding the powershell script)
https://forums.unrealengine.com/t/does-anybody-know-how-to-fix-d3d-device-being-lost/235377/9 (regarding MPO and potential Power supply issue) 

Additional Helpful Stuff for above steps : 

Type 3.2 D3D device being Lost