Hmm, strange, and its not been overwatered (causing the roots to rot)?
I'd take a look in Heyasson and see what he says, it sounds like theres something stopping the sap from rising to the leaves and fruit, so check for damage to the roots, stem or see if there's any bug infestation round the roots!
Sorry I cant offer any more concrete advice, its not a problem I've come across before!
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