It's weird. Little confused as to why knock on wont work when i double tap the middle of the screen. Knock code works perfect with the screen off and on. Glance view aswell doesnt work when i drag my finger down the middle of the screen from top to bottom but works at the left or right hand side. It's like the middle of the screen from top to bottom is unresponsive when the screen is asleep. But works flawlessly when the screen is on.