iphone 4 notification center problems

iPhone 4 Notification center problems!!
location: apple.com - date: September 11, 2012
So basically all of a sudden my iPhone notifications bar won't pull down anymore. I try to pull it down but it does absolutely nothing and I can't check the notificationsHowever if I have just gotten a message and it is showing the bar up the top I can swipe that down and the notifications bar will show.Also if i put the phone in landscape mode I can pull the bar down but I cann
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