How to Restart a frozen iPod Touch with the Home & Sleep/Wake buttons
Have you noticed some issues with your Apple iPod Touch, like performance issues (speed) or errors (frozen screens)? The first thing you always want to try to resolve these types of issues (especially freezing) is a simple little reset feature on the iPod Touch, available by pressing and holding the Home and Sleep/Wake buttons. If you this doesn't work, you can try restoring the software via iTunes. If that doesn't fix the frozen iPod, then you'll need to contact Apple or a repair technician.