Hello GreyX,
I have had similar problems out of my iPhone XS, I just bought on the 11th of November and for the past three days my phone has been freezing up while it was charging and it would be so hot I could barely touch the back even with a phone case on it.. I have tempered glass over the screen to protect the screen from cracking well today November 20, 2018 my phone was charging and it started ticking really loud where I could hear from another room in my house, I came running to see what was wrong and heard loud pop when I got to the phone my screen where the camera is at was completely shattered... I was home alone and it was laying on my coffee table charging... my phone over heated and the screen where my speaker and camera are at blew up from getting too hot it was so hot I couldn’t even pick it up without holding it with a shirt my whole screen tried to blow out... these phones are over heating dramatically and causing them to spontaneously combust... I haven’t even had my phone a week yet...