hatflix, can you describe your network? i mean equipment. i use different models of ATV with Plex and never see problems like you.
I have an ATV4 hardwired to an AirPortExtreme hardwired to a switch in my server room. Then I have a pfsense router doing the main routing. Given I do not see drops or in ability to access the net/network, I do not believe this is my system, but rather something implemented incorrectly.
My main TV has a home user permanently signed in. So, based on another suggesting, I removed the plex cloud setup, that was on my server account. I have not found a way to get my home user (even when signed in with that email and password) to be able to make the plex cloud server disappear. I am continuously prompted to the Home user login.