I will post video when I get back home.
Disconnected a remote, got the tcp removed message on the host at which point the host became unresponsive to fader moves, the channel meters updated every few seconds, but the open RTA kept updating in real time.
Decided to chance turning off host mode and it seemed to bring back the UI responsiveness. The window still remained.
Will have to wait until after set to reset and see if everything comes back to normal. 1000 people in the room, so not looking to push my luck.