Q: IPOD Connectivity issue

Did you try quitting iTunes?  Then re-open iTunes and try again.  If that does not help, shut down (power off) computer, start up, and try again.  If your computer is a laptop, connect its power adapter (so it's not running on battery power).  Also, if you have other USB devices connected (especially USB storage devices), disconnect them and connect iPod to a direct USB port on computer by itself.  Try more than one port.

Here's more info

If iTunes doesn't recognize your iPhone, iPad, or iPod - Apple Support