This is recently occurring on my 2012 SXT. When it first started I would just lock the rear controls out so that it would stop breaking sync.
I took it on a road trip this weekend and the rear passengers wanted to use it though. A few days into the trip and suddenly it's blowing hot air in the back.
I decided to lock the rear controls out again, but when I went to the screen to do it the temp slider was flying up and down like crazy without anyone touching the knobs.
I wound up waiting for it to slide down to cold and pressing lock just as it hit the bottom. It's been left alone since. I'm curious if it's a problem with that control panel, or the HVAC system itself.
