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How good is your scanner? I simply cannot believe that such behaviour would not register codes. VCDS has an aggressive mode which will pick up codes that have no other symptoms.
Limp mode will limit revs but it usually requires an ECU cycle to clear it.
If not that then it sounds like wastegate control. From my experience Audi controls all turbo wastegates pneumatically and the control value is usually N75. That valve could be bad or you could have an intermittent vacuum leak.
 
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