Domain Registratration Failure

Does anyone know what reasons for a domain that fails to renew.

"Domain renew failed"

we had three similar domain example.com, example.net and example.org. They all seemed attempted to renew at the same time with only the .com and .net renewing with success.

We got this email with a no reason on why it failed. "Dear AWS customer,

We weren't able to automatically renew registration of the example.org domain.

This happened for the following reasons:

We apologize for the inconvenience. For more information, contact Amazon Web Services Customer Support.

Regards, Amazon Route 53 "

More details: This is a "subaccount" from our University's main account. This has never happened before. As I write this post, i notice it attempted to renew again but this time it was successful. Just wanted to ensure we understand why it occurred now.

-jason