I use the Android version of this app, and it stopped responding to me as well when my control unit began flashing. Because I couldn’t get the app to respond, I uninstalled it and then reinstalled resulting in the app notifying me that I don’t have an account. The app doesn’t even recognize wifi or the bluetooth signal from the device. I am not able to create an account on the app either.
Orbit has now made my controller inaccessible resulting in me not being able to control my watering efforts. Please let me know if/when your app will become usable again.