Sometimes when I turn my G35 Sedan off, remove the key, and then open the doors, the front two windows roll all the way down. If I leave the key in the ignition however, they don't do this, but obviously I cant leave the key there. What I had to do to fix this (so far) is to lock the car using the vehicle remote with the doors closed and then unlock them and I am able to exit normally.

Any ideas why this occurs and any permanent fixes or links would be greatly appreciated, thanks everyone

 

My guess is that your G35 is somehow receiving an extended signal to unlock the car. The front windows will roll down if you hold the 'unlock' button on the remote, or if you unlock the car manually and hold the key in the unlock position for more than a few seconds. If you have a remote, I'd make sure it's not the problem, but if you don't, it's likely a faulty locking mechanism. Either way, it's probably a problem best left to a factory trained tech and one to resolve SOON.