Poor heat management after Oreo or dying phone?

Anyone else phone getting really warm after the Oreo update? I was in the beta and didnt notice it then but any day over 75 degrees it and mine gets really warm and the battery takes a hit. I got 2h5m of screen on time today and I'm at 22%, temp was in the high 80's today.

What y'all think? Is it dying or is it Oreo?

FYI phone is about a year old