Jolt when releasing brake on autobox

[Djones55]

Hi, I have a 2012 Astra Elite 2.0 CDTI auto which I've had for a month.

When releasing the brake after holding at traffic lights or stop start traffic etc, the car jumps forward as if it is late in engaging drive again.

It seems to disengage drive slightly when held in D (I notice a slight change in revs and less pressure on the car to move forward), and when releasing the brake to pull away, there's a real jolt as it takes up drive, before I press on the accelerator. If I notice a slight change in revs, I will flick the car in neutral then "D" immediately and it's fine. If I'm VERY VERY light on the brake, it doesn't hold and is fine, but anything mre than featherlight pressure on the brake to hold the car will result in a jolt when releasing the brake.

I can put it in neutral, put the electronic handbrake on then select drive to pull away, but don't want to do that if in stop start traffic.

I have a 3 month warranty with the car so am keen to see if others have had the same problem, as I never had this in my previous VW auto.

Thanks, a great forum by the way.