First upgrade the device to latest version. Normal use it should not heat. If it's heating show to ur nearest samsung gallery. As I am watching videos for around 3 to 4 hrs and it never heats up
Go to setting then in device care. Check performance profile. Keep it on light. And optimize your battery. This will help you to keep your phone cool. And battery life to increase. Hope it works for you.
Hey i am using my device in lite mode, i was getting great battery life at the beginning, but now it is worse, many are reporting heating and battery drain issue after the August update, i don't know will it be fixed in September update, as it only contain security patch
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