We need a little bit more information about your problem. But the phone has the ability to detect an overheat. The LED lights located on the front of the phone will begin to alternate between red/orange to green. Also, check to see wht temperature the phone shuts down. Do you have an app installed to tell you the temperature of your battery like Battery Indicator Pro? They have a free version of this app. Are you just talking on the phone when this happens? Do you have any apps open? Is your radios turned off (Mobile Network (3G), 4G, Bluetooth, GPS, Hotspot)? Or do you have any of those radios on when this happens?