The HVAC systems seem to have a mind of their own right now. Yesterday it was 87 degrees in my Jeep, and the only way to cool it down was to hit max a/c. Every other setting either did nothing or blew hot air in my face, even if I selected floor vents.
The, hopefully, good news is that a fix for the system is due out shortly. Chrysler has been working on it since last year.
Like some others here, mine started acting funny after the last 'fix', but only intermittently. Knowing the fix was coming I didn't mention it to the dealer. I was concerned that in an attempt to repair it they would do something that would interfere with the upcoming solution.
I just thought of something ... It happens
Are your settings tied to the memory triggered by the key fob?