If something isn’t working right, try restarting iPod touch, forcing an app to quit, or resetting iPod touch.
Restart iPod touch. Hold down the Sleep/Wake button until the red slider appears. Slide your finger across the slider to turn off iPod touch. To turn iPod touch back on, hold down the Sleep/Wake button until the Apple logo appears.
Force an app to quit. From the Home screen, double-click the Home button and swipe upwards on the app screen.
If you can’t turn off iPod touch or if the problem continues, you may need to reset iPod touch. Do this only if you’re unable to restart your iPod touch.
Reset iPod touch. Hold down the Sleep/Wake button and the Home button at the same time for at least ten seconds, until the Apple logo appears.
You can reset the word dictionary, network settings, home screen layout, and location warnings. You can also erase all of your content and settings.