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It sounds like you're experiencing some unusual behavior with your iPod nano. I'd suggest some of the troubleshooting steps in this article:
iPod troubleshooting basics and service FAQ
The headphones don't work
I have tried resetting the ipod, restoring the ipod. The ipod works fine until the screen goes off, sound cuts out instantly. I have no clue why it would do it except a power issue. I enjoyed the ipod until it started doing this.
Thanks for the suggestion.
Any others before i inquiry about taking it in for service, and does anyone know how much to fix an ipod nano 6th generation.