I don't usually plug my iPod to my computer but a month ago I needed plugged it in to make a security copy.
About a week ago again I plugged in to make a iTunes demonstration to my girlfriend. After I was done I notice the my iPod had some I my most recent noted and some contacts erased. I know for sure that I didn't press anything about the iPod.
So I'm wondering why Is this happening and of there is anything I can do to stop it next time I plugged back to my computer.
Are always connecting it to your one syncing computer?
If so I have no idea except is the same iCloud ID used on another device and are they being deleted from another device. They could also be deleted by going to icloud.com, sign in and going to contacts and notes.