Need help with Pathfinder NAV system

I have a 2005 Nissan Pathfinder that has radio/navigation system screen that randomly shuts off. I have no radio functions nor can I see hearing and ac controls. Anyone else experienced this and if so where should I start looking for?
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But a random glitch in a 13 year old vehicle with a complex integrated NAV system is going to be anybody's guess at this point. You need diagnostics to get some direction on how to approach this.