We have SharePoint 2010 Designer workflow with 3 levels of approval on a list with about 4600 items.
The workflow works fine but randomly one of the levels of approvals is getting canceled. Users reported that when they approve the second level, third level tasks gets created and the outcome becomes Canceled automatically. We are not able to reproduce the issue on our end.
Out of 4600 items, last level of approval got canceled for about 14 items until now.
The outcome for the first 2 levels is 'approved' and the last level shows as 'canceled'. There is nothing logged to the workflow history, ULS logs do not show any errors. Overall Workflow status still shows as 'In Progress'.
We did not start the Workflow with System Account for the canceled workflows.