Why does my IPOD completely wipe out when I turn computer off?

Can someone tell me why my IPOD erases everytime I turn the computer off? Sat I had to sync my IPOD. Sunday morning the IPOD was completely gone and I had to restore the IPOD again. Re-synced again Sunday and this morning my IPOD completely wiped out again and I have to restore. I'm tired of restoring It's beginning to be a lot of work. In fact when I go to Itunes it just says restore to factory settings I keep restoring it says the same thing The software is up to date

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