The HTTP 429 Too Many Requests response status code indicates the user has sent too many requests in a given amount of time (“rate limiting”). A Retry-After header might be included to this response indicating how long to wait before making a new request.
Source: 429 Too Many Requests - HTTP | MDN
Are you sending a lot of requests at one time? Are you making requests at the same frequency as before? It seems there’s a rate limit threshold that has been reached here.