"429 Client Error: Too Many Requests for url: https://api-inference.huggingface.co/models/google/flan-t5-xxl" despite no connection!

Hi all,
I am on the Free plan and have built a RAG app month ago (using Langchain/Langserve) that uses flan-t5-xxl.
It was all working fine a month ago but upon trying to use it this morning, I get the above message…
It has not been used in a month so no connections and it failed from first attempt today.
I can’t find info on what the requests entitlement is on the Free plan nor usage to date.
Many thanks in advance.