Data queues, while very efficient, are prone to occasional damage. Sometimes this damage can render the data queue unusable.
The solution is to delete that object and restart Data Thread. Data Thread will re-create that data queue upon startup. Once the Data queue has been re-created, the monitor job (IDT450) will automatically catch-up cleaning out the Data queues and copy the data to the data vault within Data Thread
Note: For complete details, see the Data Thread Administrator's Guide.