The three error codes you list all indicate something on the client side 
causing the issue.  I will suggest that you download and look through the 
Symantec NetBackup Status Code Reference Guide 
(http://www.symantec.com/business/support/index?page=content&id=DOC5181).  
There are some very good notes on what these codes mean and suggestions on how 
to resolve them.

For the 13 and 50 errors codes, this is usually indicative of something killing 
the client side processes.  For the 41, that's kind of generic but indicates 
some sort of client side issue.  All three codes could be because your AIX 
servers have extremely high numbers of files (millions) or is extremely busy 
and is taking longer to respond to the file list requests than the default time 
out parameters.  Take a look through the bpbkar log files to get more 
information about what might be generating the errors.

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