Last week after uninstalled Visual Studio 2017 and installed 2019 my cover stopped working.
Tryed everything: deleting drivers, force drivers update, fresh windows install, restart, shutdown, clean contacts... Even try the recovery image rendering my surface useless and and to install Windows from a image.
So after all this the cover has a erratic functioning: some short spaces work, most of the time is not detected, and sometimes keeps shifting from detected/not detected by windows keeping asking about entering tablet mode.
The cover doesn't light up in uefi menu so I think it has any problem, buts a strange coincidence after installing/install visual studio.
Even more strange so much people complaining about this problems with covers. My device has 5 years, buts completely functional (i5/4gb/128gbssd) not used a lot.
**bleep**...