Sounds like a failed air mass meter or air leak on the inlet ,manifold.
Check the air mass meter on live data (measured value blocks) on VAGcom. Look for the set of results displayed in g/s. With the car stationary, rev the engine, briefly with full throttle, allowing atleast 5000rpm. You should be seeing an output of atleast 190g/s. It will prob be about 45-50g/s at idle.
If the figure is higher no worries but if less than this you need an air mass!
Check the inlet manifold bolts as they come loose but also they are prone to breather pipes and the Suction Jet Pump can fail and allow the ingress of unmetered air.
ANy ofthese faults give the issue you have but it MUST be sorted as this can shag the 'box! The gearbox ECU uses air mass signal to calculate torque input so it must be corrected fairly quickly mate
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