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I'm not sure if you are aware but the DME on some models (I can't say all because I don't recall. N55 at least) also uses input from the DSC to more accurately detect knock by way of wheel speed sensor input. It's the rough road detection feature. The way I understand it works is by detecting a mildly oscillating rear wheel, ie the wheel is bouncing up and down under acceleration. The wheel will gain speed in the air.
It might be worth cleaning the wheel speed sensors and their reluctor ring if yours are of the exposed type.
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