Error 400 with the Buffer module

Hello.

I have a scenario that posts to Twitter via Buffer.

Since last Friday, May 9th, it’s returned the following error:
“400: An unknown error has occurred, please get in touch if this persists.”

It doesn’t provide much information.

Some other runs give an error of content already published. I assume the information does reach Buffer, and therefore the next time it detects the same content, but for some reason it isn’t published.

Any ideas? Has anyone else had this happen and been able to solve it?
Thanks.