I have an '03 A4 3.0V6 Quattro, and I too have had the same problem. I took it to the dealer and they said it was a battery problem, they replaced the battery, and the frequency has gone down, it still happens, but not very often anymore. There was no indication of a low charge or a bad battery, it was the oem battery that came with the car from the factory (bought the car in Germany from the factory).
Hope that helps some.
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