Re: Not receiving ISO response during high volume transactions

> 
> ISORequest r = new ISORequest(msg);
> mux.queue(r);
> return r.getResponse(timeout);
> 
Is there a log attached to your channel? 
do you see the response in that log?
do you see any exception/channel disconnect after the message is transmitted?
is there a key collision (i.e. two messages at the same time with the same mux key?)
what's the value of your timeout?