Calls bug(?)

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http://forums.androidcentral.com – Has anyone else's S4 during a phone call screen go black as if the ambient ir sensor turns off the display but then is unable to turn the screen back on? I can't use the phone whatsoever because the home nor power button turn on the display. The display lights back up when the caller on the other line hangs up. Any help? From my Sammy Galaxy S4 :D (HowTos)