I am no expert but here is a thought. I know in my e70 if i hold the unlock button long enough it will open all windows and sunroof. If you got the same feature maybe the unlock button is stuck...

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2009 BMW X5 xDrive 3.0i, Sapphire Black on Saddle Brown, Technology, Premium, Comfort, USB

2007 BMW X3 3.0SI, Titanium Silver on Black Nevada, Technology, Premium, Winter, Premium Audio (Traded in)