I noticed that happening to my Nest Thermostat (non-learning) this
Summer. I did same as you set it to Away and forgot about it for a few
days, you should be able to do that with Smart Devices correct?When I
did get curious how things were going and ...
I fee for you My Nest Non-Learning Thermostat also started to have
exact same problem about 20 days ago... I tried all the same things as
you but no luck so far... The cause may be due to the Sonos Patents
Fight that Google just lost... I sure hope...