My heating system stops turning on at hours of darkness? I have switched to 2 different thermostats and replaced fresh battery...

I have switched to 2 different thermostats and replaced fresh battery in them, contained by each thermostat the warmness will remain at the target temperature until untimely morning when I wake up to a house explicitly about 10 degree lower then the target temp. Switches are set to HEAT and Fan is set to AUTO. Being that I own gone thru 3 thermostats I highly next to the same result - I reason i can rule out this being the issue. Now the electric fire will kick put a bet on on if i Slide the switch from HEAT to OFF back to HEAT within the morning. This has me wondering if in attendance is some sort of timeout relay in the furnace or if near is some other sort of simple thing i can audition for either surrounded by the furnace.

Any and all tips are appreciated...thx
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Answers:    There's a component anticlimax it the furnace. As it happens when it is hot, it could be a little things. But what is happening is at one point the part is trying to fire up and failing that, it trys a couple times more. Then it goes into standby mode until you reset it. Time to send for the tech. And check with the BBB for complaints that would indicate a dysfunctional company.
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