Why is my LG G3 going blackscreen?

Why is my LG G3 going blackscreen? It just shuts off. I've removed battery and put back numerous times. Removed sd card. It will vibrate with powered by android and lg symbol and then black. Dead. remove battery and go though the same routine. it has turned completely on for a little and then dead. then remove battery again to reset and it acts as though it wants to cycle up then black. WHATS HAPPENING ??

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Re: Why is my LG G3 going blackscreen?
Customer Service Rep

T-Higgins, making sure your phone operates to its fullest capabilities with no interruption in your screen going black is a must. When did this first start? Have you attempted to place a new battery in the phone to rule out the battery being the culprit?