So I'm noticing recently that something odd is going on with my HVAC system. So if I've got the blower switch set to panel, it will blow through the panel but shortly after it moves to defrost. Then it will go back to panel and back to def, this happens regardless of what position I put it on....
Anyone know what could be causing this and how I can fix it?

 

Sorry gotta bump this, I need some help with this one.