Individual bolted connections on the front axle may not have been tightened to the specified torque.

https://www.productsafety.gov.au/recall/audi-australia-pty-ltd-audi-a5-f5-my2018?fbclid=IwAR2purwJq7j9ZXdJMg9wcJO_z-iaEHXENQAdqWa3deOK87eLM13bSbMTiuk