In rare cases the DSC (in ON or DTC mode) will overreact in 2WD mode and pull power, despite the car being in a stable driving situation. You can mitigate this by disabling the DSC (long-press on DSC button) or using xDrive Sport/Snow/Custom.
The reason is mostly uneven wear between front and back tyres. This can often be corrected by adjusting the tyre pressure in the front/rear tyres by 0.2 - 0.3 bar or using a different tyre set.
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