...or along the same vein as what Andrew was saying, perhaps some time after the car has been locked, the unlock button has been inadvertently (long) pressed unlocking the car and activating the global open. Since the doors have not been opened with in the 2 minute time frame, the car has then re-locked itself and left the windows open.
Try keeping the keys on a table, out of bags and pockets etc. to see if that helps.
Cheers,
Sean
“Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.” - Albert Einstein
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