i had the same problem exactly and the dealer said its normal because of the run flat tiers.
Actually, i did not believe so, i went to tires workshop and i checked the wight balance of the wheels and i was all totally out of balance.
after re-balancing of the wights, the vibration disappeared and the car was great.
i went after to the dealer to complain that they did not identify the problem in the first place and i had to do it myself. and they admitted their mistake.
so, your problem i am sure, you need to check you wight balance of your tires with specialist.
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