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Did you try turning both your phone and car off and then on again after removing and re-adding your BT device on both the car and your device.
Mercedes Benz on Naito Prkwy
My wife had that problem with her C300. They had to replace a chip and the whole stereo head 2 Grand. I had a similar problem with my ML320 had to replace the whole stereo for 4 grand. She got Mercedes to replace her as for free because it was their fault I was not so lucky
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