Can you check that screen locking is enabled? You can do this bug going to: All Settings -> Brightness & Lock. On that screen, ensure that "Lock" is ON and "Require my password when waking from suspend" is checked.
Can you check that screen locking is enabled? You can do this bug going to: All Settings -> Brightness & Lock. On that screen, ensure that "Lock" is ON and "Require my password when waking from suspend" is checked.