Device getting over heated

Hello There,

Firstly, I would like to thank you for creating this platform where we can get answers to any kind of questions we may have. Secondly, I am using a samsung note 4, without any specific reason the device gets over heated and starts rebooting on its own, some suggest me to change the battery and someone suggested me to change the mother board. One trigger which I could observe is when I activate my data connection or wifi. Otherwise I need to keep this on ultra power saving mode to use it. Please help me with this.

Best Regards,

Kailash Gupta