SQL *Net more data from client - waiting too long

I have a developer 6i forms application, when they search on one particular screen, screen intermittently hangs for about 3 to 4 minutes. when I look at the back end the session is waiting on "SQL *Net more data from client" event for more than 3 minutes. While this freeze is going on, I had the user do a tnsping and regular ping to see whether there is a network hiccup, none was found.

Can any one please explain me what "SQL *Net more data from client" event means. What can I do to drill more into this issue?

any help is greatly appreciated.

Thanks
Deen

--
http://www.freelists.org/webpage/oracle-l