Why is my phone getting overheated?

My samsung galaxy J2 pro shows me an overheating notification. When it the notification pops up there is no signal in my phone and after sometime it comes back again. I couldn't access to the internet due to the signal problem which only happens when the system gives the notification of overheating. I have reseted my phone three times but no use. There are very less apps in my phone.
Any help is highly appreciated.
Thank you.

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