I've had serious problems with mine also. It was just freaking out. I thought I was going to have to replace the entire unit. I went to the dealer and read up on how to diagnose the climate control system. It turns out there is a reset sequence for the climate control computer. Mine has behave fine since then. I have the pages copied from the dealership manual sitting at home in my manual if you can't find it. It involves holding a couple of the keys down while power it up. Let me know if you need it.
craigk@ricardo-us.com