Yea I didn't bother until that loop showed up today. On the top right side you'll see a section of line that looks like slightly folds in more than the rest ... That was there early on and seems to be progressing along the edge.
That loop is very thin. Wonder if it's just extra being pinched out somehow
I got mine replaced today at a Microsoft store....I would take that in if you have a store near you and I am pretty sure they will give you a replacement....the bluetooth quit on mine and they just checked it and replaced it....good luck