Any owners (or former owners) of this racquet experience premature cracking? There's a kid I teach with this racquet, had it for 3 months, and it already has a crack. I was hitting with him last week when we both heard a "pop" (shanked ball) that sounded very similar to a string popping. After a brief inspection, he didn't notice a broken string, so we played on. Yesterday he gave his racquet to me to restring, which was when I noticed the crack. I remember hearing the pop and figured that's when the frame cracked (I have personal experience with that sort of thing...unfortunately). I do know some frames have a propensity for premature breakage compared to some others - I just curious if this was one of them.