I don't mean to dog pile, but I came across this thread because the exact same thing happened to me. We were out of town for an extended 4th and the Oklahoma Summer arrived. I came home to a pretty brown yard and parched beds. In looking into it, my 16z 1st Gen (which I installed about a month ago) went offline and never watered while offline. I have since been unable to get it back online for more than a minute at a time, and it was enough to see that the yard hadn't ben watered for over a week, and it isn't running anything while offline. I have 2 schedules, a fixed evening schedule, and an odd-day morning "main" schedule.
Side note, I've tried 2 entirely different routers and different network setups, following all the troubleshooting I can find, and can't get it back online at all. I'm wondering if it might not be defective? I'm open to any ideas I might be missing to try to get this thing back online, as I'm a bit at a loss.
Thanks for any guidance.