When I reverse, within the first meter, a distinct bang comes from the center-left part under the engine and, 50% of the times, also on forward gear.

I have Multitronic.

At official Audi Zentrum they changed 4 months ago a flange on exit of gear shift and now they changed left semi-axis, but still withou results.

Any hints?

Thank you very much

ciao

Maurizio