Aha! Thank you for that explanation, scalesusa...much clearer to me now.
I do update frequently but given this explanation, I will do my part to keep the numbers down :) I am guessing those call numbers must renew daily as it seems to fail early evening but is fine after midnight.
The reason I assumed it was an ebay error is this post:
https://community.ebay.com/t5/Member-To-Member-Support/API-Error-Code-518/qaq-p/24372744
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