My works domain has an automatic desktop lock after 15 minutes. It is enforced by going to screensaver and having the on resume password protect option selected.
I am unable to disable this option on the local machine, as it's enforced by GPO, and I am unable to edit the GPO as I don't have the permissions.
Whenever this laptop goes to Screensaver, when attempting to return to the desktop, the login window isn't show, however the mouse will still move. The only way we've been able to get around this is by doing a hard reset of the laptop.