sorry, but i think your case sounds very weak, routine maintenance is normal, and those maintenances can be performed in a few hours. if you choose to leave it with them for longer because of convenience factors, than that's your choice. So in actuality you really only had 2 issues, one of which was resolved. Your only case is the camera that's not working, and that's not a strong enough reason for anyone to deem your car a lemon and BMW certainly won't buy it back. If you are really unhappy with it, you can always trade it in for another car.
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