iphone 5 screen goes black
On two occasions the screen on my iphone 5 (ATT) has gone black. The only response I can get from the home button and power button is for it to take a screen shot of the blackness.
This occured most recently while completing a voice call.
After a few minutes the phone seems to return to normal.
Is this an indication of a problem?
AS
iPhone 5, iOS 6