Best solution if you have persistent overheating and the batter drain problem with NOKIA LUMIA 1020.

* Go to the setting then batter saver and select when it should activated.Bear in mind that it will reduce updates and prevent apps from running in the background.                                                                                                                                                                                               * Use the back key to exits apps so they are not left running in the background.                                                                                                                                                                                           * You should make sure that your battery is actually full charged..to know it go to setting>>phone saver>>batter information                                                                                  * You should hold the volume down and the power button for at least 20 seconds to hard reset the LUMIA 1020.                                                                                                                         * Make sure that your operation system is up to date through setting>>phone up date>>check for up date.                                                                                                                                                * Make sure that your apps is up to date.                                                                                     * You could try a factory reset to complete wipe your phone,before doing so you should back up all your basics information and start reset go to setting>>about>>reset your phone and see if that help