Worked great (Nest3 t. Stat) until last update. Now app control is lost and indicates thermostat is offline 1minute ago 90% of the time app is opened, even tho t. Stat and router indicate it's connected. For me, last "bug fix" has made the app nearly useless. I can still use the app effectively to make schedule changes. Have already reset everything (even factory reset) multiple times and un/re-installed app to no avail.