The phone restarts because the power button was pushed first. Holding the power button down will cause the phone to restart. To take a screen shot, the power button and the volume down button must be pressed at the same time.
Alternatively, if the volume down button is pushed first, the ring volume or other volume setting will decrease.
It is recommended to use two fingers when taking a screen shot, one for the power button and one for the volume down button.
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