I too use this phone so I may suggest you what to do if your phone heats 1. Uninstall useless apps. 2.Reset all the settings. 3. Restart your phone. 4. If the problem continues try your phone in Safe Mode. It will help you to know whether any third party app creating the problem or it is due to software. 5. The last idea is to take back up of your personal things and try factory data reset. I think it may help you.