My first razr fell off my bed to the floor (3'-4'), and the glass cracked across the screen. It fell on its side, so I'm guessing being so thin and rigid creates a vulnerability on the edges. I was with in my 30 days and replaced it with the maxx, feels much sturdier, plus i ordered a soft case from new egg to give it some padding for the next fall.
They hyped up the durability of the phone so much, I'd think if you call for a warranty replacement with a little social hacking they may replace it for you. It'd be worth a try.
Sent from my DROID RAZR using xda premium