What is Device 921 (click on the blue link in the message).
It looks like device 921 is HADB. It seems the websocket connection is sucessfully established but an error occurs immediately after, prompting a reconnection attempt. Enable debug logging in HADB to get more info.
I just deleted it but thank u.
I would shut down and pull power for 10+ seconds then restart the hub. That should get it back to normal with that issue now resolved.