Same Issue
We have a 2017 3820fk and we have the same issue. I mounted a small thermometer next to the thermostat and it sometimes drives the temp down to 5 or 6 degrees below the setting before shutting down. But the cycling on off is annoying. I have taken back three times complaining and they tell me there is nothing wrong with the unit. I thought the thermostat was too sensitive but they checked it as well and blessed it as good. Hopefully, I have it on record under warranty if it ever quits.
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