Devices have segment (the piece being viewed) size limits
Older devices like Sony and my Astak choked on pieces >260K
Even if the did not choke, One huge segment caused the device to be sluggish.
Split the file
(IIRC Calibre Editor Validate does warn if it sees a oversize segment.)
BTW did you tamper with the default? Preferences:Output Options: split files larger than: (260K is the original default)
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