Your first Major service is at 60,000kms. As part of this service, they do the DSG as well which is a pretty costly exercise given the expense of the DSG fluid. If you are over the 60k mark, then check to see if the DSG got serviced previously. If it hasnt, then this is a less than ideal situation, to say the least.
It may also come down to a possibility with the mechatronics unit associated with the DSG.
I am sure all will be revealed when they give it the thorough once over. It's just hard to offer any real diagnostic based on your general description. It could be anything from a simple service to replacement of parts, and id rather not put the fear of god into you by needlessly speculating.
Let them run the appropriate diagnostic but be sure to be clear and concise with your description of your problem, but at this stage your saving grace is at least the dealer warranty should it be anything substantial.
As a final note, if all ends up pretty routine, try and pick the car up mid afternoon, not at the end of the day so if there is any problem you are not happy with when you drive away, then you can take it straight back.