Limit requests

[menme95]

I am having a problem reading from Azure Service Bus, like the queue stop reading, I always have this problem when the amount of messages is over 500. I have some queues reading from some queues from the same Service Bus.
When I feel that they are blocked , it happens in all of them.
Do you have any parameter like: "MessagingFactory.PrefetchCount Property" this which could be blocking us?