I would have thought if there were too many messages waiting on processing it would invoke the below? That's assuming your are on V 2.1.9.
A change was made to the event processor in the hub. It was found that some hubs can send so many events that the processor is overloaded and the hub will stop processing events. This processor has been reworked and there is now a limit to the number of events that can be sent to the processor at one time (1024), if the event queue goes over the limit an error message will be thrown and the system will log an error “Limit Exceeded Exception, Event Queue is Full”.
