I have a 2002 1.9Tdi 130 A3 and its happened twice now. I have been accelerating and all of a sudden theres a loss of power, no bang or warning lights. Just the turbo stops working, I certainly can't feel or hear it. Yet when I switch the engine off and then back on again, all is fine. The second time it happened it stopped at about 3k revs. Anyone know what this could be?