Volvo XC90 never ending story

Hello dear Volvo community. My third Volvo is now an XC90 D5 BJ2006 136TKM The vehicle was top a few months ago and without any defects. After the determination of a somewhat spongy driving method, the crossbar jacks were detected when the wheels were changed in the spring. Didn’t bother me in itself. But if it’s defective, you switch too. Had I rather let it. After the exchange of the crossbars and measuring the axle by a Volvo workshop I have a The car was picked up in the evening. It was all right. 2 days later, when we parked out of the garage with wheels hit over the edge of the board, a “klong” from the VA on the left and the steering wheel was a bit crooked again. Immediately the factory noticed the wrong steering wheel and immediately complained. So back to the workshop and let it be straightened. A few days later, the 150TKM inspection was on. Cross handlebars were, of course, found impeccable. The suspicion was expressed that the drive shaft and/or cathedral bearings could be. Drive shaft was allegedly glued to it. No improvement. So I was advised to exchange cathedral bearings on the left, including coupling rod. Said-do. When driving out of the workshop garage backwards over the edge “klong” – everything back to the old. Volvo-Mechaniker achselzuckend “woh Tomorrow we try SEM screws. So much for the history. Now my real question comes. This “Klong” comes to 90% when driving slowly backwards over unevennesses with beaten-in wheels. From time to time even when braking abruptly until the stop e.g. before the traffic light. After that there is rest during the whole journey. Also during the load change. Until the vehicle is switched off for min. 20-30 min. The curious thing is that since the change of the transverse handlebars and the appearance of the “klonk” noises the steering wheel repeatedly turns wrong in other directions. So sometimes to the left, sometimes to the right. Hard to reproduce itself. But imagine that this fits after a “klong”. Cross handlebars were meanwhile found OK by 2 independent workshops. Did anyone ever have this from you? Greeting Alex