I have a Samsung illusion phone with NO custom ROM or root or any updates at all.. And one day out of the blue while I'm charging my phone it turns off (I was sleeping) and then I turn it on and its at this screen where it says Samsung in bold white letters (like it does when it usually boots up) and then turns off.. And then weirdly enough, it turns on again then off then on AGAIN.. It only lasts for about 15-20 tops then turns off.. I dont know if its a software or hardware problem..this is my last resort.. Please help!! (Personally I think its a faulty power button but that's just me)