My wife's car is like that, you set it to 72 and it'll blast really hot air or really cold air depending on the outside temperature vs inside. I wish it just blasted 72 degree air. I just always use it in manual mode now so its not constantly switching.

Is she still under warranty?

Yeah, my gf does something similar, but opposite. She doesn't like it going full blast so she turns down the fan which turns off the auto. I think if she had the version I did she would actually use it correctly.