Proxy Code not getting executed always

Hi PI gurus,

Need your inputs/help.

We have created file to proxy scenario in SAP PI.

Messages are processing successfully from PI and processed successfully in sxmb_moni tcode (with checked flag).

But only for few messages we are getting output from proxy code.

When XML is directly trig-erred from sproxy tcode , out put is always generated from Proxy code.

I have restarted the channels , transported the objects again, but no luck.

Please let us know how to resolve this issue.

Regards,SV