I have just bought a 2013, DS5 diesel hybrid, automatic, and after a long journey, (typically motorway, high speed,) when i have reduced to low speed, (in traffic) there is a clunking noise that I feel is coming from the back. Either diesl or electric modes. When you accelarate (above 30k) the noise disappears and the car is as it should be. Also when the car is first used and when it cools down the noise cannot be heard. The best way to describe the noise is a little like a stone in the tyre as it goes round.
Any ideas please?