My best app on my iPhone is constantly showing my nest as offline, however the thermostat shows connected with no issues. If I go to the thermostat and reselect the wifi, the app will come back online for a few, but then eventually just goes back to offline again. This has been going on for over a week. I want to stress that there is no issue with the thermostat itself - it’s always online and never shows offline or disconnected from the wifi. The issue seems to only be with the nest app showing it offline.
I'm sorry to hear the issue still persists, and I appreciate you trying to find a fix. Let's find out more about what happened.
Please let me know if that helps.