[Hodo]

I havent had this happen to me but I dont have turbos.... I would be rather surprised if I had a sudden boost surge on my NA.

All kidding aside. I belive the stock turbos on a TT are vacuum controled wastgates integral on the turbos. But these are also controlled by the ECU. which if there is a problem your ECU will go to safe mode and cut boost. You may want to pull codes and see what you get.

And let us know what you find out.

Now I am sounding like the techhelp line for Volvo....... God I need a new job.