I purchased two iPhone 11s last week one for myself and one for my wife. Right away i noticed mine getting pretty hot while it initially installed all my apps from iCloud. I remember thinking, wow i don’t think my iPhone 7 Plus ever got this warm ever. I have felt the 7 Plus warm of course in the past but i don’t remember it getting so warm so fast. I dismissed it thinking its under heavy load installing everything, ill revisit this once everything is installed and the iPhone has cooled down afterwards. My wife’s phone did not seem to get as hot as mine. Hers is a white one, mine is the black one not that it should matter. I am waiting for a case to be delivered in the mail for this phone so i havent used it that much for fear of dropping it unprotected. Once i get it in a case it will be in my pocket fulltime. Fast forward to today, i was watching a Youtube video on it and after one 10 minute video the phone was seriously hot again. So i jump into battery settings and was a little stunned at what i saw.. Youtube was at 10%, Mail was at 10% and everything else was under 4%. However, there was also one app that was at 66% and that app was NordVPN. So i instantly made sure the NordVPN widget wasn’t running in iOS and i turned off NordVPN in the Background Refresh settings. Boom.. Phone instantly cooled down to normal. Since then for laughs i have been running Youtube videos in Youtube app at 1080P setting (720P in reality) for the last 40 minutes and the phone doesn’t even get warm now. Its 100% normal.
So check what apps are causing the constant load on your battery and disable Background Refresh on those apps and see if it fixes the issue.
Worked perfectly for me... Screw you NordVPN!
Mike