Hi!
I have an issue with blender lookdev mode. My object is fading away, but i’ll upload some pictures.
I tried reinstall blender, factory reset, reinstall my graphic card drivers but i have the same issue. After is start moving my object in shading this happen ( Picture )
Spec: I3-3220 / R9 270 / 10GB Ram / Windows 10
Blender ver 2.91!
Downgrade your video drivers to a version before 20.11.2.
Its not working, I have the same issue 
Something else ? I try search for windows update… maybe