Defrost not selectable

[Gypsy161150]

2015 1500 LT.   I looked but did not see this issue anywhere else on the forum. This happened a couple times, the latest being today.  Cold, snowy day here.  After driving for a while with the climate control in auto, windows start to fog a little on the inside.   Tried to manually select defrost but could not. I could select vent, vent/floor, or floor. But no combination of button pushing would successfully select defrost, or defrost/floor.  After turning truck off and restarting I was able to select whatever I wanted. Anyone else ever see this? What was the fix? 

[calgator73]

It happens occasionally with newer trucks. Pick any feature on the truck. By the way if you leave your truck in the auto position and make sure that your AC light is on the vehicle will adjust automatically to keep your windows from fogging.

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[Gypsy161150]

Was at the dealer today for oil change and mentioned this issue since I have an extended warranty. I can never get it to fail when I want it to, but figured why not bring it up. Told me that the tech did get it to act up and not do what he wanted it to do manually. Said buttons would randomly stick, so new control head is on order and will be replaced under warranty when it comes in.