Mine did the exact same thing. I had assumed it was my fault in that (as best I can remember) it came with a protective plastic sheet when it was new and I thought I forgot to peel it off. In the process of the sun hitting it I thought it just sort of baked itself on and now it is that protective sheet that has dried out.
I am terribly sorry to hear about your Nest Camera issue! I can imagine it’s been quite frustrating being without a working device. I would love to look into this further for you.
We will be reaching out to your email on file to collect some information from you. Please respond as soon as you can, so we can get the process started. Please let me know if you need any further assistance!