I’ve been having similar trouble with the app lately. I know the system well and I’ve never had any problems like this up until a few days ago.
When I go to open the app, most of the time it doesn’t even open – I get to the opening screen with the little connecting circles and they just keep spinning and spinning. One in a while, it does get past there to the main screen, and that screen is frozen solid. It doesn’t accept any touch input.
I’m on an Iphone 5, latest IOS. No other glitches in any other apps. I’ve not made any recent changes to the phone.
I have plenty of memory available, over 7GB.
It happens on my home wifi, my work wifi, and over the air.
I’ve shut down all other apps.
I’ve rebooted the phone several times (including hard reboot holding both buttons)
I’ve completely uninstalled and re-installed the Rachio app.
Hope the fix comes out soon.