Have I run into a data record limit OSC-CREST-00008 when PATCHing?

Summary

Able to patch a certain amount of data then get OSC-CREST-00008 even though same data patches to an otherwise empty-ish record

Content

    "type": "https://tp-sc.custhelp.com/services/rest/connect/exceptions/OSC-CREST-00008",

    "title": "An internal error has occurred",

    "status": 500,

    "detail": "Cannot save/update: Reclaim(ID=259): \nDB API Error\n",

    "instance": "Unexpected internal problem: %s",

    "o:errorCode": "OSC-CREST-00008"

I am recreating my failing API patch in Postman and getting the above error when patching to a record that already has a lot of data in.

If I patch exactly the same fields to a different record that includes these fields but all the other fields are set to minimal size just the word "Text" or 0 then it patches OK.