Lock screen problems

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http://forums.androidcentral.com – So every couple days or so my lock screen will just not work like the lock circle thing will come up but when i try sliding nothing happens it just doesnt respond the only way to unlock it is to pull the notification bar down and press one of the notifications like a text for example and i have to restart my phone to fix it does anyone know why this happens or how to fix it? (HowTos)