Skoda Superb 2018 190bhp 6speed dgs grinding noise when coasting

Hi, I have a skoda superb 2018 that I bought a while back. The other day I reacted to that it have a faint grinding sound when coasting and letting the rpm go below 1k and it changes gear between 3 and 2 like when you are letting go of the accelerometer before you stop for a red light. It's very faint and I haven't reacted to it before but now it annoys me and there more it annoys me, the more it worries me. 

It dissapears when the car gets warm and I only notice it between 3rd and 2nd gear. 

Any ideas? The sound might have been there all the time, hard to say...