Steering wheel oscillations with Sandero 1.4

Hello, After initial satisfaction with my base sandero I unfortunately have to report something rather unpleasant after 4000km. In the speed range between 140 and 150 km/h medium-strong steering wheel rotations occur. So the same as it occurs with unbalances of the wheels. The repair attempts carried out by the workshop were so far unsuccessful. The wheels were remedied. From front to rear replaced. The drive shafts as well as some parts of the front axleweaved This led to a five-day workshop stay. However, the problem is still present. The workshop is baffled and the master told me now you have to change parts gradually, because you can not recognize anything. I will start my two-week holiday trip on Saturday first and hope that after my return the problem is solved. I will report about it here. See you soon!! Greetings