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I might have figured it out?
The author is Patricia McKillip, listed as 'Patricia A. McKillip' on Calibre. But I noticed that the books that WEREN'T disappearing didn't have the stop after the A - they were listed as 'Patricia A McKillip'.
I edited the metadata to remove the dot from the author name on the other books; sent them all onto the kindle in AZW3 format. And now they've all been stable, no more vanishing! (At least not yet...)
I have no idea why this made any difference, but hopefully it helps if anyone else runs into the same problem!
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