hello
Does you service/process as and exit endpoint?
is it a queue? If it is a queue, did you watch the queue limit?
You can setup some extra trace at the esbcontainer level to see what happen.
regards
Chan Jérémy
The reason could also be that messages are not processed any further. That can be because the destination (exit ep) of the service has filled up and you are hitting flow control.
Tracing is the right way to go here to understand what is going on.
If you are using Sonic 8.0 already you can make use of the JMS Connection view in the SMC too.