rapid3642

Hello, one night when using the auto roll down button on my driver side window the window stopped half way down, I then rolled the window down the rest of the way however, it acted like it didnt know when to stop and it would make a loud clunking noise when attempting to go past full buttom. When rolling the window up I get the same thing, it doesnt know where full top is and trys to push the window up even though its all the way up. It seemed like it lost all sense of full top and full bottom. Any ideas on how to fix?