Which hubs exactly do you mean? I notice that the Bhyve is working okay for me just now with faucet controllers, but maybe there are different servers in different continents. I have had issues with the app before on android, you can try deleting cache the app in the Apps area, via the android settings area. Under ‘Storage’, there’s a couple options of types of data – user data and cache data, maybe you have to delete both. You could also try rebooting your home router, and unplugging your USB bhyve hub and plugging back in again.