Yet another data point on timeline:
Picked up new X last Saturday.
Sunday morning I got notice of an available download (2018.12) and did it right away
Later that day I had a warning about out of date or missing map data pop up. I didn't take a pic and then couldn't get it to pop back up.
This week Thursday I believe I finally got my maps and had a notification waiting for me.
I believe it was the same day that I had 2 crashes of my system. In the morning, the touch screen went blank when I got in and I had to reboot it.
The other it rebooted both the center screen and IC when I got in and started driving later in the day.
Neither has happened since, so I chalked them up to intermittent systems issues.