iPhone 4S with iOS5.1 power button ending calls ?

hello iphone users,

have upgraded iphone 4s 5.1 , noticed issue/bug.

used use feature lot on iphone, being on call lock screen many reasons. found same power button ios 5.1 ending calls.

not sure should think problem feature or bug ? 1 else noticed same. there work around ?

thanks
bg

 

really? thought while pressing power button during call supposed end call (i believe there discussion on while back) :s

 

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