The shading bits are probably the individual map tiles, greying out.
Next time it happens can you take a picture or a short video of the screen, please. I meant to do it when I had the problem in the (tunnel free) Morvan. Garmin are asking me if I had one.
Next time it happens can you take a picture or a short video of the screen, please. I meant to do it when I had the problem in the (tunnel free) Morvan. Garmin are asking me if I had one.



Less is more.
