Yes, full powering off had no effect unfortunately.
I like the keys doctor idea, This was a device at a remote site so unfortunately we could not run keys doctor.
You know, it may be the data plan, I received a warning when my card did not go through (I had just ordered a replacement so it was a slightly different number) I did check with Particle and they were showing everything active, and not blocked.
Have you experienced this sequence of lights flashing before?
Also, while keys doctor is useful tool, what would it take to keep a device from needing to use keys doctor? This would be for a product where I would like to avoid needing to have the client perform maintenance.