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When I got my 03 350z the drivers window didn’t work. One day I was messing with it and found out it will work if I hold the down button, open the door then close it with the button still held. It will work up and down until it goes all the way down or all the way up. Then it stops working again.
It really sounds like you need a new motor, not hard to replace just takes time. Driver side window is way easier to fix then passenger window it seemed to me.