Did the nostr:npub18m76awca3y37hkvuneavuw6pjj4525fw90necxmadrvjg0sdy6qsngq955 relay screen change with latest TestFlight build? I’m confused by Online tag or lack of. 
Discussion
My guess would be that "online" means that you have an open websocket connection with the relay. And when missing then the websocket failed to open. Maybe restarting the app will have it try to reestablish a connection.