wo adaptor produces "broken pipe"s

We're facing a weird problem all of a sudden. This one app ran fine for 
quite some time and now it chokes all the time and gives the following 
feedback in the log file:

[2004-12-07 15:52:53 CET] <WorkerThread14> <WOWorkerThread id=14 
socket=Socket[addr=/192.168.1.40,port=
55917,localport=2007]> Exception while sending response: 
java.net.SocketException: Broken pipe

After a bunch of these entries, usually we have lots of CLOSE_WAITs on 
the port of the application and the app becomes unavailable.

Does anyone have a good idea on how to debug this? Thanks a bunch for 
your help!

Regards,
Will