CentOS - Oct 2013 - ddclient stops running

I find ddclient stops running after a time
on a remote CentOS-6.4 server.
Has anyone else found this?
I think it has been happening for a couple of months.
I notice because I get complaining messages in my logwatch.

-- 
Timothy Murphy  
e-mail: gayleard /at/ eircom.net
School of Mathematics, Trinity College, Dublin 2, Ireland