My wife's iPhone 15 Pro Max running iOS 17.03 got pretty hot today while simply charging on a 20W Apple charger and 2m braided USB-C charging cable. It was about 40% charged at the time. No Apps running, but WIFI and BT on.
She got the iPhone last week...Are there processes (indexing, etc) that only occur when the iPhone is placed on a charger? Is there anything like "activity monitor" on the iPhone that I can check to see what its doing the next time it happens?
Mine gets hot too with the 20W charger, it's fast and under 50% is charging harder so it will become hotter. It will become less hot once it passes 50/60%. I use a 5W charger mostly as I don't need speed. But that's normal, my 13P became hot the same. Never seen a warning message though, that's the important thing.