Does it happen to all the users or to a specific user?
Look at the Event Viewer Application Error Logs.
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I have several PC in my organization that are experiencing this issue. When a user locks a PC if the user doesn't log back in with 30 seconds the lock screen displays a spinning circle where the password text box was and then the text box disappears completely and the only way to log back in is with a system restart. This issue is a recent issue, and I have uninstalled the latest windows updates, removed wireless/wired keyboards, updates the graphics card drivers and have not had any luck resolving this issue. This issue occurs on laptops and desktops of various models. All Dell hardware. Re-installing windows on all these systems will be a very time intensive undertaking and in addition the issue has already come back on previously wiped systems.
Does it happen to all the users or to a specific user?
Look at the Event Viewer Application Error Logs.