Need Opinions and suggestions. Rear passenger window.

I don't really know whats wrong with it but it stops after I start rolling it down I have no idea what is going on and I can't go look because the car is out of town right now but I would like some opinions on the problem if you have any idea. thanks

Not saying this is it, but it has happened to me before...
Due to wear and tear the parts get worn down, and when the window reaches a certain point it actually jams because it gets miss-aligned.
I don't know all the technical names for the parts, but the easiest way to do it remove the side panel, and re-install the handle. Then simply watch where it's getting hung up. Depending on how yours is might just be a missing bearing, or worn bushing... probably something simple...

Where in Canada are you?