Well, a bit over 3 problem-free years with my Q5 and now my car developed small, but annoying issue - since few days there is knocking sound coming from driver seatback. It is hearable when the car is leaning forth and back (e.g. when crossing speed limiters or driving on bumpy road). I can easily simulate this by applying changing force to seatback - rapidly pressing hard with my back and then releasing the upper part of seatback. While it sounds coming from seatback itself, most likely it is coming from 'hinge' area or even seat itself... Anyone faced similar problem and know some fix to this? Is there any easy way to disassemble the seat to investigate? Pease advise!