My climate control unit has stopped working. It's on, looks normal (i.e. displaying the temp, air flow speed, etc etc of the last setting I had it on) and air is coming out of the vents, but none of the buttons work. I can't change anything, turn on the heated rear window, front demister. Nothing works! Tried turning off car and back on again but still no luck. Happened about a week ago but started working again. Has it died? Anybody else have this happen to theirs??