Connection Dropped Unexpectedly

I am still occasionally getting
com.ibm.as400.access.ConnectionDroppedException 
thrown in my program and wonder if anyone else has seen this.  It occurs
either 
during SequentialFile.addPhysicalFileMember, or during CommandCall.run
(CPYF...). 
This is in a Java application running on a PC under Linux, accessing an
AS/400 
using the IBM AS/400 Toolbox for Java.  We're running V4R2. 

I have successfully trapped this exception in order to let the operator
try 
again, but I can't understand why this only happened in the last few
weeks, 
since the program has been in production for over six months.  Any
ideas?

P.S. Calling getReturnCode() on the ConnectionDroppedException returns
2.

-- 
____________________________________________________________
Glenn Holmer                          gholmer@weycogroup.com
Programmer/Analyst                       phone: 414.908.1809
Weyco Group, Inc.                          fax: 414.908.1601
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