ok i have a samsung s2 skyrocket for t mobile...my warranty is up and every once in a while my phone shut off by itself and it begins to vibrate every couple seconds. if the battery is in it'll keep doing it and once i put it back in it does the same thing. whether its from being charged or the battery being in. after i place the battery it begins its initial start up then it do again. any one kno wat the problem is or how i could solve this problem?