iphone 4s screen freezes after calls

iPhone 4S screen freezes after calls
location: apple.com - date: November 25, 2011
My iPhone 4S has been giving me problems this past week after I make a call I won't be able to hang up or tap anything on the screen with a response I can tap the end call button and nothing with happen unless I press the lock button twice to hang up the call than again to lock the screen than slide to unlock than my iPhone will work fine. This is quite irritating! Is there any fix to this?
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