Why is my Samsung galaxy 3 screen going black?

A

AC Question

Okay so I have an s3. If I'm not on my phone for about 5 hours, the screen goes black and I can't do anything but the LED lights still work. When I turn it off and back on again, the screen starts working again. But everyone I leave my phone for a few hours, it keeps turning black and I have to turn off my phone again. Can anyone help?
 

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