Most likely cause is a failing battery. If your car still has the original MB (Varta) battery then I would start with replacing that.
Otherwise, if the battery is relatively new, then get the battery checked by an auto electrician, or try trickle-charging it overnight before condemning it. And check if it's still covered by manufacturer's warranty.
Other possibilities are a failed ABS ring on one of the wheel hubs - which should also flag-up an error code when checked with STAR.
Most likely cause is a failing battery. If your car still has the original MB (Varta) battery then I would start with replacing that.
Otherwise, if the battery is relatively new, then get the battery checked by an auto electrician, or try trickle-charging it overnight before condemning it. And check if it's still covered by manufacturer's warranty.
Other possibilities are a failed ABS ring on one of the wheel hubs - which should also flag-up an error code when checked with STAR.