BMW Repair Questions? Ask a Mechanic for Answers ASAP
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the problem is that your DSC system thinks the car is slipping and is cutting in when it should not be.
this is a very sophisitacted system with a number of sensors and a computer module that inform it.
the problem could be as simple as a bad sensor signaling a slip event, but it could also be the control computer itself.
the ONLY way to verify is via computer diagnostics which can read faults from the system and monitor the sensor readings to identify if any are out of spec.
so, the cost could range from a few hundred to over a grand, but you will need to invest in a proper diagnostic to verify with certainty the cause - this is a requirement based on the deisgn and function of the system.
Please let me know if you have further questions. Please do not forget to click a positive rating as this is the only way I receive credit for my answer, thank you. Best wishes with your vehicle.