Thank you for the details of the issue you are experiencing with your iPod nano. I found a couple of resources that I think would help in a situation like this.
First, I recommend resetting your iPod nano:
How to reset an iPod nano (7th generation)
Press and hold the Sleep/Wake button and the Home button until the screen goes dark. The Apple logo should appear after a few seconds, then the Home screen should appear.
You can find the full article here:
If the issue persists, follow the steps in this article to restore your iPod:
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