Are you connected to WiFi?

A Kindle user that had successfully downloaded in the past was successfully checking out ebooks from OverDrive, but they were not downloading correctly.  They were showing up on the Kindle in a sort of book purgatory called the "Archive", where they couldn't be accessed.  It turns out that their Kindle was not connected to a WiFi network where the patron moved.    Once we connected to the library WiFi all the books uploaded successfully.