One of the first things to try is a soft reset. Rather than completely restoring the iPod touch, which deletes your iTunes Store purchases, a soft reset forces the device to reboot its operating system — iOS in this case. This process is non-destructive and ensures that you regain control of your iPod touch without the risk of losing your media such as songs, audiobooks, podcasts, and more.
Instructions in this article apply to all iPod touch versions.
To force a reset on the iPod touch after a freeze or other problem: