It seems that at times, with no regularity, when I press the Home button, the phone's screen goes dark. When I press the side button or double tap the screen, the date and time appear without the fingerprint icon (which I expect since I have Extend Unlock and Trusted Places activated/configured). When I swipe to see the Home screen, I get the PIN page with the message "Enter your PIN, as required by the security policy, instead of using your fingerprints".
