On my old Golf 2.0 tdi I experienced it when I was driving on low revs ( 5th gear in 50mph ) and didnt change gear before overtaking.
Talked to the guy that tuned my car, and he belived it was the torque limiter who disengaged the clutch.
Don´t know in which revs the ED30 has most torque, but I guessing around 3500rpm or something.
It was a serious problem with my old TDi, so I want to be sure before tuning my ED30.