Why does my Galaxy S7 get hot when charging and when I'm using it (not charging)

[AC Question]

1. My Galaxy S7 is about a year old and in the last 2-3 months it's been getting hot when I am charging it with the speed charger that came with it.
2. My Galaxy S7 gets hot when I am using it and not charging it.

Can you tell my why and how to fix it?

I have have already turned the fast charge off in settings>battrry and it continues to heat up.

 

[belodion]

That surely needs attention from and diagnosis by a repairer, unless it's simply that you need a new battery.

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