Here is a little tip easy to execute. It will permit you to check if you have some issues on your Root partition of your iPhone or iPod Touch.
You can handle it with the application Mobile Terminal.

• lancer Mobile Terminal.
• Type « su » then « root »
• Typer your password (alpine by deafault)
• Type the following command : « fsck » or « fsck -f » (last one is to fix issues if detected)