Occasionally an iPod or iPhone may freeze or fail to respond to your commands. This can happen for a number of reasons and does not necessarily indicate a serious problem. Sometimes they just need a restart much like the way your computer needs a reset once in a while.
Restarting an iPod or iPhone is a simple procedure that will not erase any of your music, data files, or customized preferences.
This MethodShop.com tutorial will show you how to restart a frozen iPod Shuffle, iPhone, iPod Touch, and even older iPods from 1G to 4G.