driver's side mirror folds slowly '05 King Ranch
 

The power folding mirror on the driver's side has gotten quite sluggish. It used to fold in smartly at the same rate as the passenger mirror but now takes a second or two longer. 1-2 seconds doesn't sound like much but it looks goofy as hell while it's happening, also I've had a few occasions lately where it never quite folds in completely. Has anyone been through this already? I have as much extended warranty on the truck as the Ford dealer would sell me when I bought the truck used but in my experience you have to know what you want first before you get much out of that sort of thing. Any advise or additional information about this I might find helpful is appreciated.