S3 Reboot when playing Video. Please help

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http://forums.androidcentral.com – Hy guys, I just bought a Samsung Galaxy S3 from my friend. It is rooted and use TouchWiz Rom. When I play Video (especially HD files) my phone auto reboot after 3-5 minutes playing video. I tried many time and everytime I got the same result. Example: I download an HD Video clip on Youtube to my phone and play it using internal player like: Vplayer, MoboPlayer, BsPlayer, Mobo Video Player Pro ... And after 5 minutes or less, my Phone freeze and reboot automatically. I tried to clear the catch using "App Cache Cleaner" and stop many app I don't usually use but it still the s (HowTos)