An active process was set to "On Hold", and all its instances that were running were set to "Aborted".
Release : 16.1.1
The process storm detector has detected that there were too many instances of the process for a single object instance (e.g.: a specific project), how they are distributed, or how quickly they are triggered.
When this occurs, the process will be put on hold and all the instances will be aborted. These cannot be moved from aborted to a different status.
Review the circumstances of why there could be so many instances of this process and adjust it to prevent this situation. Re-validate the process and activate once this has been changed.