Thanks for reaching out, @emanuelp.
Due to increased latency with the async analytics endpoint POST stats/jobs/accounts/:account_id, there has been a drop in success rate starting at 2017-08-19 05:45 UTC. We are currently actively investigating the root cause of the issue.
In case of any issues with async jobs stuck in PROCESSING state, the recommended path is to use the DELETE stats/jobs/accounts/:account_id/:job_id endpoint and re-try once the issue is resolved.
We will update this thread as we know more.