I had a problem with the driver's window. It was going up very slowly and sometimes it stopped halfway and started going down, as if something had blocked it. When it rained, it used to make a terrible noise no matter if going up or down.
I have a tendency to try fixing things on my own, so I disassembled the door to see what the problem was. I read about several people having window guides problems, so I checked those first. They were OK. I greased them anyway, but the window was still going up very slow.
After an hour or so, I found the problem. Inside the door, on the middle, there is a stiff rubber piece, triangle-shaped. Its purpose is to prevent the window from vibrating inside the door when its rolled down completely. If this rubber piece is too close to the window, there's a problem. When the window rolls down, it pulls the rubber piece half way out. The rubber piece gets stuck between the window and its placeholder. This is not a problem until you try to roll up the window. The rubber piece will not go back to its place, but will apply pressure on the window, which explains why it goes slowly only when rolling up. Sometimes the pressure is so big that it fools the electronic into thinking there is an object between the window and the door frame and this automatically stops and rolls down the window (standard feature to protect your hand, head or whatever from being crushed by a window rolling up

).
Anyway, back to the problem. The solution was to bend a little the metal rod that holds the rubber piece, so that it doesn't get pulled out by the window. I had to roll up and down the window some hundred times to figure out the problem, but worth the effort. The problem never came up since.