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I've had the Nest for maybe a couple of years now. I do like it however when my air conditioning or heater is really working hard, I get an error message indicating the nest is not connected to thh heating or cooling system (not a wifi issue). It always takes care of itself but is a little worrisome especially living in MN. uncertain where to place blame.I'm in MN and used to have the same problem. Finally figured it out last January one night when it was -20 and furnace wouldn't kick on. There is a battery in the nest that charges when furnace/ac isn't running. During heavy use it can't charge and battery wears down until the use slows down. Solution was to do a dedicated wire from furnace to nest for charging. Haven't had the issue in almost a year now. This was from nest support FYI and not just a crazy hack