If you eliminated incubation issues, and you eliminated pairing issue (same pair producing viable offspring in the past), than it's just one of those things that happens.
I had hatchlings crawl out of the egg and die, some take 2 or 3 meals and die, 1 die while constricting, it's just one of those things.
You can always have a necropsy and it could reveal some issue like aneurysm or other defect but it would not change anything and would not be something you could prevent (unless this pairing consistently produce weaker animals)
They are not all meant to be whether it's eggs or hatchlings.
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