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Blank nav screen

My nav screen, since the day after delivery, is just a grey grid. Other 4G services are working. And if you zoom to JUST the right level on nav, the map comes back in certain neighborhoods.

The red arrow (indicating my position) still updates, so the computer is working. Seems like the 4G isn't updating the map somehow. Is this a known issue? I did a search here and found one thread from early 2014 with folks saying, "Call it in."
I was told by service you have to :

1. Restart the main screen (hold down both scroll wheels on the steering wheel until the big 'T' shows)
2. Reboot the center console (Hold down both 'upper buttons on the steering wheel until the big 'T' shows)
3. Repeat step 1.

This reset the LTE for me. I have also had it work by just doing the first 2 steps.
Call the Service Centre. Loss of GPS occasionally happens after the LTE upgrade. In my case it the SC caught it before they gave the car back to me. I don't know the fix, but I suspect they have to reload firmware.
In general, that's correct but the loss of GPS after the LTE upgrade can't be fixed that way. Apparently even pulling the fuse doesn't work either.

Apparently the lack of GPS issue I had immediately after my LTE upgrade was a short. I received the following today, from my service advisor:

"Your car had a short in a wire that went to module for the navigation antenna! I’m happy we found it, it was not easy!"

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