Yes all 4 should come down simultaneously if pressing the fob. To this day my biggest fear is still the windows coming down on their own during a storm. Too many stories.

BTW, the parked car ventilation - you'd probably have the same result if you just opened all your windows as soon as you got back to it... hot air can escape pretty quick.

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr