So far so good the past few days. I know what to do in the future if it comes back. Probably good to do a full power down every once in a while. It is a computer on wheels after all
I use the "power off" command after every firmware update completes. I only do them at home (firmware updates), and when I see its completed the update process, I do the following:
1. Go out to the car, open the drivers door and get into the seat. I do NOT close the drivers door behind me.
2. With me sitting in the drivers seat, but with the drivers side door open, I access the "power off" command as discussed above.
3. after pushing the button to power off the car, I exit the car through the still open drivers door and close it.
This lets me shut down the car until "the next time I go to drive it" and ensures that I am doing not only a full shut down but a full "shut down and car goes to deep sleep", at a minimum of every firmware update. Doing it this way, I have not experienced any strange glitches etc after firmware updates that people sometimes report.
In effect, I am doing a "full shutdown / power off" every firmware update, and then not powering on till my next drive, whenever that is.