If you try to downshift when the rpm's are too high the computer will not allow you too as it protects the engine. Try upshifting quickly and running at low speeds then downshifting then. If that doesn't work then you will want to take it in as its not normal.
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Retired - '08 E90 335i Sparkling Graphite/Gray Dakota Leather, ZSP, ZCW, ZPP, Navi, ipod, Sat
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