This has been going since yesterday afternoon and causing disruption to my business.
Excuse my ignorance but is the problem at the 123From builder end and how to resolve?
From Zapier
That error means that we are unable to poll 123FormBuilder for new submissions due to a server error. Server issues are usually temporary and may resolve on their own when the overload on the server reduces.
There should be no data loss as subsequent successful polls should find the submissions that were missed by the errored polls. If the issue still persists after a while, do let me know as I may have to report this to the integration developers.