This isn't a problem. This is actually used to help with the air pressure when you close your door. Have you not noticed when you close the doors on a car that sometimes the windows puff out a little bit? The top of our windows line up along the roof and not along the top of the doors like other cars. So when you close your car door the windows would normally flex out. So what Nissan did is made it so the window comes down just that little bit, so when you shut or slam your car door shut this doesn't happen. The window then conveniently rolls back up once its shut. So this is a good thing...
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