i just got my X back from the dealer two days ago, and they upgrade the transmission software to fix a hesitation. it seems like there's an error in the "transmission code." i noticed that if you switch gears on the transmission, it does react slow too. i haven't linked it to cold weather, but i know what you're talking about. i'm not sure if your problem is mechanical or electronic, but you can try upgrading the transmission software (should be free at the dealer)...it makes the car drive like a completely different car

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