I'm not sure - I've noticed this once or twice too... I was talking to someone at a Maker Faire and they mentioned that they were having problems when working with Arduinos.
Their solution was to take the transmit power down one stop from the maximum. I'm afraid there's no function for it, so you'd have to make your own by accessing the relevant register. Let me know if you're not sure though and I'll paste up an example.
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