Try opening the graphics settings to reset the game-specific config. Make sure EFB to RAM is set to EFB to Texture.
Alternatively you can try switching to Direct 3D 9
As for why this happened randomly, it could be because of a Windows update or graphics card update. I assume you're using the same Dolphin version, or that may be the case too.
Alternatively you can try switching to Direct 3D 9
As for why this happened randomly, it could be because of a Windows update or graphics card update. I assume you're using the same Dolphin version, or that may be the case too.