Just restart the phone and it'll immediately stop! I got my phone from the MetroPCS store for free and only a few times has this happened I will say that my iPhone literally would shut off in the cold and when I try to talk to Sprint or apple about it I just got well you have an Apple device isn't that great! so it's not as bad as having a device that when you walk into a warm environment turned back on and a hundred percent but once you go under 40 degrees it's completely Powers off to dead battery! Just restart the phone complete fix promise you