I've only owned my QX60 for about two weeks and I'm still "learning" but what I've found seems like a small bug in the display. When you turn off the display completely at night the clock still displays and the screen does not completely turn off. If you disable the clock on the nav display the screen will turn off - as in it will completely go black which is preferable - although I would like the clock displayed when it goes back on. To me this seems like a bug in the software.