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That sounds like a firmware bug. Take it to the dealer, tell them the idrive software has this bug, and they will most likely flash your car to the latest version. The downside is that it ca take 1-2 days as the program that is used to flash the ECU is prone to crashing. The upside is you'll have the latest idrive firmware when you are done, which will hopefully fix that bug and a host of others as well.
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