this started happening today when i was texting my friends the sign came up like the one u get at 15 % battery and says plz plug in phone to charger well i was at about 50% then it drops to 0 in an instant and then the sign comes up... IT JUST DID It again when i was typing any ways so it turns it self off and i go to turn it back on and it powers up and goes to my home screen nothing different look at the battery and says 50% i dont know if i should just wipe and reflash or is this a problem with the battery?