The first ran out of memory. (was this the only conversion running?)
The book was too complex or you tried with heuristics ON. turn it off, then convert. Then (optional) turn it on and do a EPUB => EPUB convert to further refine.
The second
TEMPORARY increase the split size from 260K to about 400K (found in the EPUB Output section)
Upon completion, Change it back and do another EPUB => EPUB convert
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