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I have recently developed this issue also, but mine is just a 135i.
How worn are both your rear tyres?
One of my rear tyres is worn more than the other and i'm wondering if one tyre (the more worn one) happens to be spinning faster than the larger (ie less worn) tyre, thus causing the traction control to trip? I have access to a bunch of near new test tyres at work so i'll do some testing....
I've recalibrated the transmission and clutch without success. My issue is exactly as the OP described. Stock engine, no tune, stock wheels and runflats, 135,000km.
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