Support Screen won't always turn on when pressing power button

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http://androidforums.com – The screen on my Verizon S3 won't always turn on when the power button or home key are pushed. The capacitive buttons light up, so I assume the presses are registering, but it only intermittently turns the screen on. I'm wondering if this is a software or hardware issue and was looking to see if anyone else has had a similar experience. If anyone has any suggestions, I'm open. Thanks. (General)