Nerds Assemble ! (Need help(pls))

My phone has been behaving odd recently it became too hot for a couple of mins tommorow followed by switching off almost like crashing but that mad part is , my phone has been restarting on it's own idk how It restarted randomly anytime 5 times already, within 24 hours

Do you also know any sub to ask for such kinds of digital/ phone related help? Thank you ,