I am desperate, I bought a 2017 L405 SD V8, it came with a few issues but one I cannot cure. Suspension noise on anything but a perfectly flat road. Knocking front and rear. I have replaced both front struts with genuine parts both bottom arms, front and rear drop links. Front and rear anti roll bar bushes. What is the noise? It’s driving me mad. If you are not part of the solution you are part of the problem!!