This is probably fairly obvious, but have you tried it on another USB port on that computer? I've marked this as confirmed, so hopefully someone more knowledgable with this type of issue will see it and take a look.
** Changed in: gnome-volume-manager (Ubuntu)
Status: Unconfirmed => Confirmed
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USB Memory Stick is remounted every 10 seconds
https://launchpad.net/bugs/70008
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