A4 s line 143 cutting out/stalling help????

Only had the car 3 weeks and its cut out/stalled a hand full of times now! Usually happens when you are slowing down coming to a complete stop or taking off! The car is a 58 plate a4 tdi 143 with only 25k!
I was just wondering if anyone has came across a fault like this before and could point me in the right direction of the problem? I have done a quick search but the only thing I can find is that there is a common fault with the injectors?

Any info would be of great help cheers peter!

Yes I got a years warranty with it, I was just wanting to get a better understanding of the problem before I go to the garage with it so they don't bull**** me.