Some of your issues sound similar to mine;
2017 Dodge Journey Crossroads
I’ve only owned it a little over a year and have had this problem since about 2 months in, but it was a frequent issue and now is becoming quite the irritation and leaving my kids sweltering in the rear.
I posted my vid to YouTube, it was too big to post here, see below. What happens is I notice the rear A/C turning on and off, I select climate on the main panel, rear in the upper right corner. The rear controls are set to front control, from there it is a challenge to get the screen to stay on fro t operation of the rear controls, it flicks on and off by itself. For the few seconds where I can gain control, I attempt to change the flow, unsecessfully, to forward from forward/floor, it goes back of its own accord. I try to change the temperature from 60 to low, again the controls of their own accord return to 60. None of the others screens or operations act like this on the main control screen. It feels a bit like the rear A/C & Heat are possessed, turning on and off at will in a 60 second period about 6 times on its own, if I am working with it to try to do my will nearly 30 in that same amount of time.
Anyone have any suggestions?