Bug when using applications when the screen is locked

Hi
i've got a problem when i updated iOS from 8.0.
When i want to open camera and another applications in control centre my iphone with iOS 8.1.3 at first switch application on and than my screen become fully dark.
I fix it by restarting, but then after some time the problem make again.
How can i fix this?
And when do apple fix it?
i've got Iphone 5s gold 16gb iOS8.1.3 model A1533

Chavdar
There is a sensor on the phone that, during a phone call, turns the screen off when you hold it to your face. If your screen is turning off you are either holding it to your face to trigger the sensor or the sensor itself may be bad.
If the screen goes black without holding it to your face try to reset:
Hold the Sleep/Wake and Home buttons until the screen goes dark and the Apple logo appears
If that does not resolve the issue you can determine if it is a software problem by restoring your phone
as a new device.
Restoring iOS Software
If this does not resolve the problem there is a problem with the sensor itself and you will need to schedule a Genius Bar appointment or contact Apple for a repair.

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Bug when using applications when the screen is locked

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