iPhone 7 overheating and battery drain.
So I recently purchased my second iPhone off of eBay in mint condition. Everything runs smooth except for 2 things, overheating and battery drain. Whenever I use an app like Snapchat or Snow, my phone will overheat around the camera and power button side. It gets really hot. Not only does my battery drain when it overheats, but it will also drain quickly when it’s not over heated. I checked my battery health section on my iPhone menu and it’s capacity is at 84% with normal peak performance. I’ve tried everything from unchecking the app refresh to resetting the phone entirely and nothing has worked. Anybody else have this issue? I’ve tried contacting the seller but I got no response.
iPhone 7, iOS 12