Why won´t my display turn off when i call (iphone 4s ios 5.1)??

hi
i have a iphone 4s with ios 5.1
since i updated to 5.1 i have the problem that the display won´t turn off,
when i call with someone.
i have reset the iphone more than one time.
I don´t know what i can do more.
ps: sorry for my englisch

ach nee....
i have no protection on the iphone and i know the display turns only off when i hold it at my ear.
my problem IS that the display won´t turn off when i hold it at my ear.
This problem is since the update to 5.1!

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