iPod Nano (7th gen) Bluetooth connection keeps dropping
First I'd try a simple restart (hold down the sleep/wake button and home button until the screen goes dark and release when you see the Apple logo)
Unpair the Bluetooth headphones from everything. The manufacturer should have instructions on how to unpair them from everything at once, or you can manually unpair them from all your devices individually.
Turn Bluetooth off and back on on your iPod.
Get a $10-$15 Bluetooth speaker from Wal-Mart and see if it will work with your iPod.


Check out this Apple Support link for additional help.