Nest learning thermostat has issues since the last software update in Nov/21. Brand new unit. When heating, it gets within 1 degree of target temp and then starts blowing cold air. I've waken up with the temp at 62 in the house when it was set to 70. It blows constantly and has absolutely wrecked my electric bill. It shows 'delayed' when I turn heat off and on again every time. I've read all the threads and tried fixes with no luck and I'm convinced it's a software issue with the latest update. Reply to Nest: I have tried everything in that thread with no luck. It's got to be an issue with the software. I emailed support with more details but I'm not optimistic. At this point, I would save money in the long run by buying a different thermostat.