Thank you for taking the time to let us know about your inquiry. I'd love to help.
There are possible reasons why the Nest Thermostat is not holding a charge, such as the thermostat's installation or wire setup being incorrect, an unstable Wi-Fi connection, having issues with the power from your system, or insufficient power from your HVAC. To isolate, could you share a photo of your current thermostat's wiring? Also, you could try the steps in this article and let us know if that helps.
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Hi, I’ve had trouble replying to this, it’s currently off again, for the last 2 days again, flashing green, if I hold it down for so long it starts flashing red, mine isn’t on the base and is plugged in with phone cable all the time, which has been fine, but I have got base out and put it on it to take back off, I don’t have a nest charging cable for it? I’ve had it quite a while, but I must never of had one, it’s not attached to wall. It usually comes back on itself but is happening every week now.
Thanks for getting back to us, @Shelly1279. I'm sorry to hear the issue still persists, and I appreciate you trying to find a fix. Let's find out more about what happened.
Please keep me posted on how it goes.