Did you know that the iPod has a secret diagnostic mode? If you suspect there is something wrong with your iPod, then you can just switch it to the diagnostic mode and run some tests.
iPod Diagnostic Mode Test
The built-in diagnostic mode iPod test is a quick and easy way to determine if you have a “bad” iPod. You just need to know the secret combination of buttons to push. Here’s a tutorial that will show you exactly what to do: iPod Diagnostic Mode