Since the windows are frameless, the window is supposed to roll down a little bit when you open the door, and roll back up when you close it. The problem is, when i open my driver side door, it does not do this. It will stay all the way up and the door wont close all of the way. When i am in the car just rolling it down or up, it works fine. It is a little bit slower than the pass side, but nonetheless it works. Could the motor be going out, or is there a sensor that tells it that the door is open or what. Need help, really dont want to accidentally break my window shutting the door.

 

probably needs the reset procedure done..
just google for "350z window motor reset"