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I have a 2010 Nissan Altima. For the past few months, my defrost has been randomly turning on. This morning when I was driving, I noticed condensation on the passenger side of the windshield and the defrost was on but the defrost button wasn't even lit showing it was on. Also, the last time I drove the car, I had the vent setting on face but when I turned the car on this morning, it was on feet. I have also noticed that as I adjust the temperature in the car, the vent setting adjust based on the temperature. This has never happened before.
 

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It's not clear what you're trying to say about temperature adjustment, but if the HVAC is "losing its memory" while the car is parked then you may have a problem in the battery supply wire to the Front Air Control. The FAC is located underneath the radio on the same shared brackets. It may be able to function on ignition power only, but will lose any settings when the key is cycled if the battery supply is out.
 
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