Did you change the split points in the conversion settings from the default of 260K? Those settings are there for a reason - your reader has a lot less memory than your pc and can crash with large chapters. 260K is well tested and safe default. Changing it should only be used temporarily for purposes of conversion, not for final output.
If it's not that it's probably a problem with the ePub in general, try Flight Check on Sigil and see if it has any errors.
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