Phone reboot issue

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http://forum.xda-developers.com – So I dropped my phone maybe a little over 6 ft hitting a tile floor. Nothing broke luckily but I did notice now if I kinda drop my phone on my desk lightly it restarts or just turns off. On top of that it happened to me yesterday and when I turned it on it had done a factory reset on its self. I don't know of this has happened to anybody else and if so what did you do. Since the reset it has happened again just kind of wondering what I should do. Sent from my SPH-L900 using xda app-developers app (HowTos)