Window doesn't drop

[Dave S.]

So I tried the search but didn't see that same issue:

Today the passenger door window wouldn't drop enough to clear the top when you open the door, and then when my wife closed it, it hung up outside the top. I opened the door and the window drops slightly, but not enough, and then if I push down or sligthly forward on the back edge of the widow it drops, the rest of the way it is supposed to. When you close the door it goes all the way up.
So it seems that something is allowing the glass to hang up even though the mechanism is lowering the proper amount.
Has anyone had the issue and if so how do you fix it. I've already told my wife to stop closing the door by pushing on the window;-).

Dave S.