iPod touch Restore Problem? Help!

[Gerard.]

about 30 minutes ago, i plugged my ipod in and for some reason it came up about "Setting up ipod" When it had already been set up. Then it had erased all my music and when i tried to add more it wouldnt let me sync, and it said i didnt have enough memory left. Then i tried to restore but now im getting an error message: -18
Does anyone know whats going on?

 

[Gerard.]

Im trying a hard restore, it seems to be restoring now.
Does anyone know why it went like this in the first place?

 

[Lin]

I got the -18 error after mishandling a manual jailbreaking... Can't tell more in your case.