In the last week, I've noticed that my thermostat isn't going on at the scheduled times I want it to. It seems to think I'm away from home even though I'm not or won't switch on until I'm home even though it's scheduled to heat the house from 30 mins before I get home.
Thought it was just me, but my bother had just told me same thing is happening to him now at his house.
In fact this issue has been well-known (to this forum) for a few months now. See for example https://www.googlenestcommunity.com/t5/Nest-Thermostats/Home-Away-Assist-returning-home-always-stuck... which links to a very long thread from late last year.
It's a shame that Google implements these attractive fancy features, but then doesn't ensure that they work. The "Safety Temperature" feature, extremely valuable, is buggy as well.
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Please let us know if you have any other questions or concerns as I will be locking this in 24 hours.
Have a great day.
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Hope this helps!