Vox Disappearing side-loaded books

Hi,

Since the last software update, my Vox has twice 'lost' side-loaded books from the library.

In both instances they were there and being read one day, and not there the next time the device was powered up the following day.

This has now happened to the same book on both occassions, and the second time it also lost another one.

Any advice gratefully received. Happy to do a rollback of the software if someone can show me how!

Many Thanks,

Mark :)