It's more than a bit concerning when you find all your car windows down in the morning and you're 100% sure you left them fully up the night before. The cause was buried deep in our owner's manual and a "feature" I wasn't aware existed, but found with a little Internet sleuthing. As divulged at the link below, if you hold the door unlock button on the keyless-entry remote for more than three seconds, the Infiniti G37x will start to roll down its windows. I must have accidentally had my thumb on that button as I entered the house from the garage long enough for the windows to descend and the closing garage door masked the sound. We're just glad the mystery was solved.