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With the gauges to the side, the info display usually switches to display turn info as you approach a turn with navigation active. In this case though, it goes just goes blank. The screen is restored after the turn is complete.
I've noticed the same bug. Basically if you're not in nav mode, the screen will blank on the next direction. You can either wait until you fulfilled the next direction or you can slide the screen back and forth.
I've seen this since I got the car. It seems like sometime it's fine with turn directions shown at right time but sometime it shows afterward or nothing at all.
It really bugs me though, Nissan Altima has the same screen but it's a lot better executed, screen comes on way ahead of coming turn.
I have seen this intermittently. Have you gotten the NAV update? Maybe this will be fixed in firmware 8500? I updated to 8500 this week. I will keep an eye out for this bug.