Sorry you are having this issue.
Can you let me know the model Nest thermostat you have? How to tell which Nest thermostat you have - Google Nest Help
A picture of that error message would also help if you can add one here.
I'm going to escalate this over to the Community Specialists from Nest as well.
I tried removing the unit from the wall and it finally unfroze. No idea if that did something or it was a coincidence but it moved me to the next screen and it's back to normal.
An official Nest response would be great instead of the previous posts where they just close the thread without answering.
I wanted to follow up with you, and see if the issue has been fully resolved. Thank you so much jacksonandy for sharing what helped resolved the issue for you. Please let me know if you have any questions from here, as I would be happy to take a closer look.
Thank you JillG for the helpful reply.
We're glad to hear that and thanks for getting back to us. We'll then consider this as resolved and we'll go ahead and lock this thread after 24 hours if you don't have any further questions. If you have any new issues, updates or just a discussion topic, feel free to start a new thread in the Community.