Did you get a response for your ticket? Mine started doing the same thing over the weekend, blank screen and all. At first the app started prompting for a password and I never used a password. I tried the PC and it was the same. I ended up having to factory reset the unit and restoring the config. It’s worked fine up until this morning when I noticed that the sprinklers came on last night even tho it rained, it should have put on a rain delay. I went to log in and got the same password prompt, Inspecting the controller the screen was blank again.
Perhaps I’ll factory default it again and firewall it from the internet and see if that increases reliability.