iPhone 7 heating up on camera side with minimal use
iPhone 7 just updated to iOS 10.2.1 2 days ago this morning it started to heat up on the camera side when using any app. Compared to the other half of the phone, this side feels much warmer. When all apps are closed and none are in use it cools down completely but heats up again quickly when one app is open (even if only the camera). Tried rebooting and this has not fixed the issue. Thing is, I've experienced this before with a previous new iPhone 7 (iOS 10.1.1) straight out of the box while setting up the new iPhone back in November and got it exchanged to the current one at the store. Is this a software or hardware issue??
iPhone 7, iOS 10.2.1