Authorizejs payment plugin has started throwing "Invalid OTS Token"

-- HikaShop version -- : 6.1.0
-- Joomla version -- : 4.1.14
-- Error-message(debug-mod must be tuned on) -- : E00114 - Invalid OTS Token.

This morning, a long-running site we host suddenly started throwing a checkout error "E00114 - Invalid OTS Token" from the AuthorizeJS plugin we've been running for about three years (v1.0.5). From what I can tell, this occurs when code attempts to run two quick processes to Authorize.net using the same nonce.

There were no software changes on our site (we haven't made the update to Joomla5 yet) no Joomla change, no PHP change, no Apache change. At the moment the error began, we were on Hikashop v5, I have since upgraded to v6.1, but saw no change. I also tested the plugin's debug setting. We bought the plugin in late 2023, so we still should be covered by its 4-years of updates offer., if there is an update out there.

When I went into Authorize.net, I saw that they had updated their user interface since I had last visited, but there were no notices of a system update on their site.

My customer's site hasn't been able to capture any orders since this began, and, of course this happens at the start of their heaviest promotions of the year.

Thank you for your help.