Help Lock screen swipe sometimes won't work

[matthewssawyer]

Hey. First some details. I have a gs 4 with AT&T and have pattern unlocking set up. I have the phone set to lock after 10 or 15 minutes. When it isn't locked but the screen is off, it requires a swipe to access the phone. Everyday, randomly, this swipe to unlock feature stops working and it takes several large touch Asta swipes to get it to unlock. Otherwise I have to swipe the task bar down to get into the phone. After an hour or two it will resume normal operation. Any thoughts on this? It is quite annoying.