Hello laurier,

Thank you for taking the time to let us know about your inquiry.

If Google Nest has repeatedly noticed that your heating system appears to have stopped heating your home for a while in the middle of the heating cycle, you'll get this alert. Data on the instances where the recorded indoor temperature dropped momentarily while the thermostat was instructing your heating system to heat your home is used to pinpoint these instances.

Were you able to find the report history? You can find these in the Nest app's Message option, located on the top-left hand corner of the home page. Also, the History tab is on the bottom-right corner of the Google Home app.

Feel free to let us know if you have more questions.

Regards,

Mark