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It appears that your Nest thermostat is showing a power concern. To isolate, is your thermostat showing incorrect ambient temperatures? Also, is there any delay or timer on the screen when calling for cooling?
Have a look at this article and let us know if you need more help.
I wanted to check in and see if you managed to see Mark's post. Please let me know if you have any questions from here. I would be happy to assist, and make sure you are good to go.