The most common problem iPod and iPhone users will experience is an occasional freeze or lockup.
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.