One of my racquets was a ProKennex 'Kinetic'. It  has this material inside the frame around the head which sounds like loose sand when you shake the racquet. I think the theory behind this approach was supposed to absorb any of the excess shock that is felt through the frame to your arm..??
I doubt your racquet is supposed to have something loose inside it.
Maybe a restringer would be able to fix it?  (at the expense of a restring)
If convenient, return it to the place of purchase and exchange it. Sometimes those sounds can be just plain annoying but wouldn't have too much of an effect on the performance of the racquet.

cheers,
gwl

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