I've got the Plex app on the ATV4. It's been nothing but a pain to work with. I cannot watch any local content unless I open up the outgoing firewall to a bunch of *.plex.tv sites. Yes, I followed all the instructions, and no most of them didn't resolve the issues.
Why should I allow my data to leave my network when I just want to watch local content?
I am now no longer using the plex app on the ATV4 - I'm using a different app on the ATV4 to talk to the plex media server.
Strangely - it's WAY faster than Plex. Loading, playing, skipping, everything is much much faster and the drop-down menus allow me to configure the video faster too (audio or subtitles). As soon as I click a button on the remote, something happens almost immediately. I'm amazed at the difference and very happy now. So happy that I had to post my story here.
I don't like being held hostage to use my apps and my devices with your approval via the internet. I don't need an internet connection to start my car, why should I need it to watch my shows? To the plex people - you have to fix this. I shouldn't have to sign out and sign in on a semi-regular basis just to use my device on my local network.