Samsung Galaxy S 4G suddenly keeps shutting itself off

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http://forum.xda-developers.com – Ok guys let's see you work that voodoo that you do so well... I got the idea to come here when someone of a T-Mobile support forum for Samsung Galaxy S 4G said they gave up on getting any help from those people but the guys from XDA were great and her phone has worked right since speaking with them. So here I am. I own a Samsung Galaxy S4 G since July 2011, no real issues at all aside from a few random freeze ups from various programs. Well, a few days ago it starts turning itself off randomly. Sometimes it turns itself back on when I press the on button, sometimes I have to plug it back (HowTos)