They’re gone now. The app was taking forever to launch and hanging. It was sitting on the “Plex” splash screen for over a minute, or opening to a black screen with no media or menus, or a screen with a black/gray blur effect and just not continuing unless I backed out of the app with some difficulty and tried again.
I tried clearing the cache and data (login) on it, even though I had just reauthed it two days prior from the customer data breach, but it didn’t really help. But when I launched Kodi and the PM4K add-on it was able to log in and connect to my server quickly, so I ended up using it for awhile.
I don’t think it was the Plex app because I saw the same issue later on with my Shield, which is on an earlier app version, and the problem seems to be gone now. It was just the Plex auth servers overloaded I guess from the wave of people resetting their logins. I reset mine very early in things and beat the rush perhaps.