We have created a queue processor.

In this we are sending the case lifecycle status to an external system.

We have created Dedicated queue processor and have scheduled the items with 5 minute delay.

When we process the items , when the queue processor is ON. The items get processed as expected.

But in case where the queue processor is shut down. In such scenario , we see that the request don't get processed in sequence.

For example:-

For a case the first status is New, In-progress and Completed.

When the queue processor is off , we see the completed status request is processed first and then the in progress and then new. 

Can someone help us with this issue.