Apple

Hello! So, my girlfriend bought her iPhone one year ago and it never took any damage so far. Recently it started heating up at random moments when she’s using it and when she’s charging it and when this happens, the screen goes black. You can still turn on the screen but it quickly goes black again. The volume buttons are responsive as, even with no image on screen, when pushed to the max or min volume, the phone gives a vibration. So, have anyone come across this problem and has any solution for it? So far tried updating to the latest iOS, restoring to factory settings and removing the screen protector. Thank you