Death of Client Access Sessions

Help!!!

I have been having a problem recently (three times in the last two months) 
with the death of our client access telnet sessions.  We are on V4R3  OS/400 
and V3R2M0 of client access..   I have checked the joblogs for the TCP/IP 
telnet sessions and it just starts refusing connections and killing active 
sessions.  It only affects the telnet sessions.  FTP and other IP related 
activity is fine..  I have been unable to trace the problem from there.  The 
only solution to fix it is to IPL the AS/400 and then the users can sign back 
on fine.  

When it starts to happen, the users screens go blank and they get an error 
message 658 followed by an error messages 657.  The 658 says that it cannot 
resolve to host.   I have let it try to recover for about 45 minutes and it 
still just sits there.

If anyone has any ideas, it would be greatly appreciated.

Thanks In Advance,

Jeff
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