When my 2004 is unlocked it decides at random when it wants to open ther rear tailgate glass. If I lock the doors it doesnt do it, but not an answer... I can hear nthe electric switch activating in the tailgate, sometimes every hour or 2 or sometimes every second or 2. Anyone come across this before. I was wondering if some damp has got into the electric contacts.. Will lube them up to see if that helps..