AC vent won't stay put!

The AC vent to the left of the radio will not stay where I put it when the fan is on 3 or 4!! I have to stick a toothpick in it.

Anyone else see this?

 

The left side passenger closes on mine when I have both drivers vents on. It only happens on the highest setting though. Ford has the best vent design.

 

Same thing here only mine is the far left one and it only does it when the fan is on high. I figure over time it'll get enough dust built up in places I can't get it out of and that will slug it down some. A couple of drops of Coca-Cola on a few of those hinges would probably take care of it but I think I will just wait. It'll stay wide open but not pointed down at my arm where I want it to be.

 

Just to clarify, this is the left/right vane that moves, not the up/down vane.