Well, it could be just a wheel speed sensor... or it could be the instrument cluster... or it could be the DSC control unit. If you want to avoid paying diagnosis fees you can try the rear wheel speed sensors first. If it still happens with new sensors it is more likely to be the instrument cluster seeing that it affects speedometer (left rear wheel speed sensor affects speedometer)

Try this, it is the same sensor on the left and right sides... Swap the left and right wheel speed sensors on the rear. If next time the ABS/DSC/brake lights come on the speedometer still works then it is just the wheel speed sensor. If the speedometer still drops out it is likely the cluster.

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