I just wanted to take a moment to mention that I suffered through a season of the exact same symptoms last year. I contacted Rachio support once or twice, and aside from promises of "engineers that were going to review logs" it never went anywhere.The Iro was the only device on my network that exhibited any network performance/stability symptoms, but I decided to replace my single rev 2 UniFi AC AP with 3 latest gen UniFi AC Pro APs. So far, so good. I can actually make changes and see them reflected in the UI (previously I'd submit a change and there would be a 20% chance of it sticking).
For now the Iro appears to be online, and has -72dBm going through multiple walls, including one clad with brick. I'll just have to assume that it pulled down the latest updates, but for now my deprecated Iro seems to be working as one would expect.