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Problem solved - but it took 1 week of work. The vacuum hoses from the exhaust mufflers was not properly closed, on my Supersprint exhaust. The installation instruction didnīt even say to close the hoses!
Dust and particles was sucked in ( over a period of 20.000km ) and slowly destroyed a valve ( in the trunk ) on the way forward to the engine!!!!
This fooled the ECU to think that there was a problem with the boost pressure and therefore reducing the boost below 4000 rpm ( where the vacuum controlled valve in the OEM exhaust normally openes ). The inconsistance of the problem was caused by the valve sometimes was stuck and sometimes not, due to dust and particles blocking the valve mechanism.
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2016 435d xDrive
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