Phone randomly turns off

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http://androidforums.com – My phone has had this problem out of the box. I thought it was a normal issue it had so I rooted and did everything and now I'm on cm10 but I still have this issue. It'll usually happen when I'm not using it. is this a known issue that can be fixed? Or do I have to send it in? Also, if I do return it, I don't have to pay for the replacement right? (General)