Reply received for unknown correlationID

There is a middleware in between of two other software components. In the
middleware I'm routing Apache ActiveMQ messages by Apache Camel.

this is how it works:

1) 1stComponent uses middleware to send message to the 3rdComponent
2) 3rdComponent replies the message and sends it back to the 1st(using
middleware).

1stComponent <<=>> Middleware <<=>> 3rdComponent

*Problem:*

I'm using ConcurrentConsumers in middleware.

In the middle of sending a lot of messages sequentially, suddenly middleware
stops all the process! there is no exceptions or messages! for example,
first 100 of 500 messages got processed and the remainders remain in the
queue as pending messages.

this warning is logged sometimes in the middle of the process:

this is the middlewares Code:

and the 3rdComponent: