If you're not seeing it yet, try doing a hard reset of your console (long - press the power button). (windowscentral.com)
Users can also deny access to a stolen phone by using another smart device to access the app, or simply doing a hard reset on the lock itself. (digitaltrends.com)
Not sure why it does it but when mine freeze like that I just do the hard reset by holding the power button down until it turns off. (fixya.com)