Thanks for reaching out and we're sorry to hear about what's happening.
If you're using the new Nest thermostat, you could replace the battery with high-quality 1.5 V AAA alkaline batteries from a known manufacturer.
Also, could you share a photo of your current wiring configurations with your Nest thermostat?
I hope to hear from you very soon.
I haven't heard from you in a while so I'll be locking this thread if there is no update within the day. If you have any new issues, updates or just a discussion topic, feel free to start a new thread in the community.