Jumping out of 2nd gear

[gocart999uk]

I have just purchased an 2007 2.7 Tdi Le Mans A6.. A beautiful car that ran superb on a short test run down some lanes. On signing the finance deal I drove away only to find the gear box popping out of 2nd gear. Normally after taking your foot off the accelerator... Is there an underlying fault that I should be weary of :-(

 

A6 2.7 TDi Le Mans (Manual box - 53000miles)

 

I would appreciate any help as I have a small window to take the car back... which I really dont want to do if I can avoid it, but dont want to be stummping up for a new box in 4 months time ....

 

Arhhh help, please :-(