rattling noise on acceleration

I have a 2012 Evoque and recently found that when I accelerate hard around 60-80km, there is a rattling noise. I have taken it in and the technician said he heard it (once with me and again on another occasion) but couldn't replicate the issue or determine the cause. Anyone had this issue or know what it might be? I am off warranty in anothr 5 km so I want this rectified.

Reena

See my post in General.