This incident has been resolved.

We have implemented a fix and we are monitoring the results

The Azure support is still working on the issue.
If you get training (or long operations) error please submit a ticket to https://support.witivio.com

We are aware that long operation might also be running indefinitely
We are continuing to mitigate the issue with Microsoft Azure Support.

We are aware that the training might fails unexpectedly on many bots.
The issue is related to the fact that we have many bot training at the same time and Azure Cognitives services are sometimes throttle.
We are working with Microsoft to delete the throttling on our cognitives services.