Windows 10 Lock Screen Stuck

I have a Windows 10 tablet. Every time when the system boots to the lock screen, no matter I slide my finger up or press a key on the keyboard, it doesn't take me to the login screen for typing password. I have to click the Power icon at the bottom right corner and select Restart. After restarting, everything works fine and I can slide away the lock screen.

I tried to disable the lock screen via GPO, then restart the tablet. I then got a completely black screen instead of the login screen. But I can successfully connect to my tablet via remote desktop. So I have to enable the lock screen again.

This is really frustrating. I have all Windows updates installed already.
Could someone here help me? Thanks in advance.
 
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