Turnstile timeout-or-duplicate server side checking

For Workes & Pages, what is the name of the domain?

n/a

What is the error message?

timeout-or-duplicate

What is the issue or error you’re encountering

We have been using turnstile without issues for millions of requests the past week. Out of the blue we starting gets lots timeout-or-duplicate errors last night (some requests still go thru but a lot return this error)…nothing has changed in our implementation and wondering if turnstile could be rate limiting us?