Currently running Plex 6.3 (18417) on my iPhone 7 Plus. I transcode and save to my phone as I’m away a lot and want to watch shows/movies when in airplane mode and in places with low internet speeds.
Ever since iOS 13 came out my phone has been getting really hot while watching with high battery drain. Also end up having to take case off phone to help with cooling as the video starts getting choppy. Never have had to do this in the past.