My nokia e63 keeps connecting and disconnecting to my audi a3 blue tooth every 30 seconds?

I connected me nokia to the blue tooth ok and then connected my wife's blackberry to it and that is still working but now my nokia keeps connecting and disconnecting every 30 seconds does any one know how to sort this problem?My nokia e63 keeps connecting and disconnecting to my audi a3 blue tooth every 30 seconds?did u try turning ur bluetooth off and setting it as hidden?

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