IMATE PDA2 RATTLING

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Hi,
I have recently purchased an i-mate PDA2, and it works fine, however if shaken lightly, you can hear a rattle as it something is moving inside. If i then squeeze the sides, the noise stops.
Its not the volume slider.
Could you please tell me if the rattle is normal, because this is the second unit i have had that does this, so i assumed they are all like it.

Many thanks in advance