Another one to add to the list.
54H006122
Mine started as a minor mark maybe 6 months in, thought it was me.
Now I'm a year in and it looks like this.
I wonder if the kind people at Garmin will replace it if it's slid over the 12 month mark by a few days, given it's a fault that's been inherent since purchase but not shown itself until now.....email sent.