Suddenly my rachio app is dead. iPhone screen dark. Other apps and functions working

Suddenly my rachio app is dead. IPhone screen dark. Other apps functioning.

@JanineSheldon I’m not an iPhone person but have a lot of electronics and software experience. Have you tried rebooting your phone? After that I would consider uninstalling and reinstalling the app. Others please correct me if I’m wrong, but I’m pretty sure that your settings would stay intact.