Sounds very much like the problem my brother had with his Audi 1.9Tdi. That would go into limp mode for no reason. A VAG specialist reckoned a new turbo as the old one was over boosting. Me, my dad and my brother all reasoned that if the turbo was overboosting, then it was certainly fine. If I remember correctly we narrowed it down to 3 things.
1 Intake pressure sensor
2 Wastegate sticking
3 A control valve that was operated by vacuum pressure
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The more people I meet, the more I like my dog!
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