We have broken up a large workflow into several smaller workflows. We have one parent workflow that calls child workflows. We use the Nintex Start Workflow action to start the child workflows. For one of the calls we have the option "Wait for the workflow to complete before continuing" enabled. For the last few months this has been working as expected. Recently the parent workflow stalls on the Start Workflow action. The parent workflow calls the child workflow successfully, the child workflow completes successfully, but the parent workflow does not register the child workflow has completed. The OWSTIMER service is running as expected and there are no errors in the workflow history/ SharePoint logs. Any ideas?