Hello, what a bummer. I'm an end user like you and have been around the nest games since the start.
The first thing to try it unplugging/removing the power for about a minute and let the camera come back on-line. If after doing that the problem is still there then most likely it has gone bad and cannot be repaired. Google will mostly replace it if is under the 1-year warranty since you purchased it.
Keep in mind if you do this and hit has truly gone bad then it may not even come back on-line at all.
Sorry I wish I had a better answer.
I'd love to hear if this works.
Good luck
