I see, I’m not the only one with this issue. Exactly what you said, it get hot on the screen around volume buttons location. Top left corner of the screen.
I have 15 plus, I’m not an active phone user. For 10h a day it just sit on the desk. When at the gym or walk I listen to audiobooks, but recently after few min of vido call my battery drained down 15%. I didn’t have this issue before, and I only charge phone to 80% to extend the battery life. Phone should not get this hot by just using it for few minutes even by just watching wideo and not holding it in hand it get noticeable HOT.