I've had issues with the satnav on our S205 Sport Premium, resulting in the unit being replaced a couple of times under warranty. All seems to be settled now, except that we no longer receive live traffic updates. My dealer generally just scratches his head and offers no solution, but I'm convinced that they have to re-register the new satnav unit with "the system" so that the updates will come. Does anyone actually know how these things work please? I've contacted MB via the Mercedes Me site but only ever receive just email acknowledgements.