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Need some insight, Have a smart honeywell thermostat, to the best of my knowledge everything is wired correctly(including the common)and no know issues with the furnace. Gas heating and no a/c. What happens is in AUTO-HEAT once it reaches the desired temperature the thermostat turns off and it seams as if the furnace reboots, after then it’s back to normal, until it repeats when temperature drops. The furnace is a bit older but not ancient. When I had the old battery powered manual thermostat this did not happen in AUTO.