Possibly water getting into the ATC CONTROL MODULE in the trunk. Bottom left corner next to battery. I had the identical symptoms and discovered a pool of water back there. That module is not water tight. Mine ultimately blew (couple months after the first error occurred) and I replaced it with one I sourced from a scrap yard.
I solved the water leak by removing, cleaning, and refitting the rubber boots that house the electrical wires running between the vehicle body and tailgate.

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