Symptoms

Email event gets stuck in a loop.
 

Diagnoses

1. Workflow to start on Item Add and Update

2. An item is added. Triggers a workflow.

3. Workflow creates a new item and updates the same item. Triggers a workflow instance.

4. Loops forever by sending remote event receiver calls to Appit.

5. Appit server gets flooded and brings everything to a halt.

Resolution

Redesign the workflow to remove the looping activities.  A Feature Request was also submitted.