i just got a microgel prestige pro like 2.5 weeks ago in great condition (just a couple scratches on the head guard) but my friend was checking it out today and he lightly dropped it on the grass (horizontally so that the string bed what parallel to the ground) and it made a hollow wobly sound. He said that my racqet was cracked but i didnt think that was possible becuz it was brand new and when he dropped his microgel radical it made a normal clunk sound. i tried it with my other racquets and racquets from my friends and their racquets made the same clunk noise. My micorgel prestige was the only one that made the wierd hollow wobbly sound. is this normal or is something wrong with it?