Do you have the original nav disc in the system or a copy?

Sometimes discs go bad (copies) and you need to burn a new one. The description of your failure matches what happened to me when I had a bad disc.

Check the navigation subforum as there are lots of smarter folks than me on what to do.

FWIW, I did the laser swap out and it is pretty easy. I don't know if you can get the part for less than the repair service that you stated above though...

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Kirk
Las Vegas
2016 X5 40e Mineral White/Black Dakota Leather, ZLL, ZCW, ZDA, ZDB, ZPP, multi contour seats, rear side window shades, HK stereo
2011 E90M3, 6-speed manual