This has been posted by others in the past but I can’t find a current thread or solution. Nest thermostat shows “no usage” in history on several days, if I click on the day where this is shown, the itemised usage stats are shown correctly. I have had nest for 5years now and this is a problem which keeps occurring. There was a note on one of the previous threads whist said this was a known issue in 2021 but it appears not to have been solved yet. I am in the UK and the thermostat is controlling a combi boiler.