Apple TV App Not 4K

I have an ongoing issue with the apple tv app on my shield pro - for some reason each time i use it, it plays in 1080 (i have a 850mbps bandwidth and all other apps are 4k). However, if I force stop the app or unplug and replug the shield it will go back to 4k. I have to do this every time I use it. I tried clearing the cache and reinstalling the app. Anyone know of a fix?