Thanks for reaching out. I know how confusing it is when one of your Nest Protects keeps saying power off. To know more about this, I'd like to ask some questions: do you have the battery or wired type of Nest Protect? Is there any light from the actual Nest Protect? Have you tried pressing the button one time of that Nest Protect?
Looking forward to your response.
How's it going with your Nest Protect? We would appreciate it if you could share with us the information that I'm asking above. Don't hesitate to update us here in this thread.
Just one quick final check in here since activity has slowed down. We'll be locking the thread in the next 24 hours, but if you still need help, I would be happy to keep it open. If there's more we can do, just let me know.