Try taking off your phone case. Some cases insulate the phone in a way that makes the phone overheat.
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If this doesn't work, try closing apps that are not in use and not using very intensive apps for large amounts of time.
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If this doesn't work, try closing apps that are not in use. Also, do not use very intensive apps for large amounts of time.
Finally, if all else fails you might want to replace your battery. There is a guide to learn how to replace your battery on the device page here on iFixit.
Try taking off your phone case. Some cases insulate the phone in a way that makes the phone overheat.
If this doesn't work, try closing apps that are not in use and not using very intensive apps for large amounts of time.
Finally, if all else fails you might want to replace your battery. There is a guide to learn how to replace your battery on the device page here on iFixit.