Had the same problem with my 320 DIESEL!! I went to my dealer with it and they came with a solution. It was a "known' problem. In this garage it was the 3th car since the E90 was out.
The problem wat an electronisch connection (something with wires) between the connection of the pedal to the turbo. They asked me to bring in my car for a day and they solved the problem immediatly.
Now... full power without exception.
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