I have the SS space black model. I have noticed at least once a day it will take the screen about two seconds to wake after being tapped. Sometimes it happens with always on activated and other times with always on deactivated. There doesn’t seem to be a particular set of circumstances for this to occur and I never saw this behavior with my series 2 or 4. It’s not overly annoying, I’d just like to know if this is a bug or if there may be something wrong with the hardware. If it keeps up, I guess I’ll put in for an exchange.