Nest 4G stopping before fully heating

[GeneralPatton]

Both my old nest and my recently purchased Nest 4g has an issue where the heating stops before the set temperature.
When set to 'Heat fuel source: Propane, the nest will heat for 10 minutes, rest 10 minutes and repeat.

When set to 'Heat fuel source: Gas, the nest will heat for 20 minutes, rest 10 minutes and repeat.

I've removed all learning protocols to make this a "dumb" thermometer.

I had a pro come over to inspect the unit and it's fine and is not sending a signal of overheating.
How do I stop this behavior?

[GeneralPatton]

Here's the latest.  I sent the setting to be electric.  It heated for 20 minutes, stopped, then immediately started again. WTF.  This is supposed to be a learning thermostat.  I would hope it would learn that if I am losing heat in my home, it should over right the eco settings and make sure my house would be heated, above all else?!

[maedacortez]

Hi GeneralPatton,

Thanks for reaching out! I understand that your Google Nest Thermostat is turning off before reaching the target temperature, and I'm happy to assist you.

To better understand the situation, I have a few questions:

• What other strange symptoms have you experienced since the problem started?
• Are there any error messages displayed on the thermostat or in the Google Home app? If so, please provide the exact message.
• What kind of HVAC system do you have? (Heat pump, conventional system, etc.)
• Does the issue happen with heating only, cooling only, or both?
• Do you have a common ground wire, or C wire, connected to your thermostat?

I look forward to your response.

Regards,

Manuel