Exterior Glass Cracking Issues, Anyone?

Question

I have been babying my Duo and was surprised to pick it up one day to find a minute crack. The nature of it, how it originated is quite odd. Not a result of my dropping it or something being dropped on it or impacting center of the glass causing a typical spiderweb cracking effect as one would expect, but rather near the edge of glass which is odd mainly because there is no evident damage to the polycarbonate chassis in that same area. Just worth noting that it could be an odd potential failure or weakness within the glass. Perhaps a result from opening/closing on itself? Did the two exterior glass panels impact each other when folded back to an extent where one exerted more force on the other causing this crack? You can see at the peak of the damage near the top of the glass, there is no damage to the polycarbonate. I don't believe anything could strike the edge of the glass without affecting the frame too which is why I am leaning towards contact between the glass backs or something caught between them perhaps causing this. Just wondering if anyone has experienced this or something similar. Hoping Microsoft Team can weigh in as customer service sent me here.