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This sounds very much like a corrupted database on the Kobo.
If you use calibre, you might like to try the Check the device database contained within the Database option of Davidfor's Kobo Utilities plugin.
If that does not help, or you don't use calibre, try the signout option from the Settings | Account menu. Be aware that function will drop the database and you will need to re-do the device setup.
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