What does the keyfob do when you hold down the "unlock" button? It rolls down both front windows.
Net result: at 2 a.m., when condensation starts to form, the circuits go "bzzt" and your front windows go down.
Kind of a disturbing surprise to come out to the next morning. So far we've been lucky that it hasn't happened when it was pouring rain. But it's just a matter of time.
Le sigh! To the nearest Nissan dealer we go.