Hey! I need help. My phone died. I was in the middle of a text and the screen slowly faded to black. I got home and charged it thinking it was the battery but it said fully charged. I unplugged it and tried to turn it on and nothing... But when I try to turn it on plugged in it lasts about a minutes then shuts off again... Why is this happening and what can I do? Already tried a factory reset, twice.