I have an up-to-date Samsung Galaxy S7. When I choose, "Do Not Disturb," with the exception of "Favorites," it works except for one thing. When someone from my favorite lists calls, it rings but doesn't show up on the screen. The screen is completely black. So in order to answer, I have yo be very quick of putting in my passcode to unlock the phone and then I can see who's calling and can answer. Problem is… most times I'm not quick enough before the call goes to VM. Especially if I was sleeping. Any suggestions, opinions or guidance on how to fix this problem?