I noticed these cracks on my 935 the other week and mailed Garmin. Got the reply that this is physical damage and that I would have to pay for a replacement. Not really buying that... Looks the same as everyone else to me?
I really hate to be that guy but yours doesn't look like the resin problem the 5/5x users are having. I've now had 3 of mine crack and they start as surface cracks that spread, yours looks like they are shattered from under the resin layer.