[CentOS] connection refused resolving - after 5.4 upgrade

Hi all,
prior to 5.4 upgrade, my two DNS servers would only get
'connection refused resolving .....'
on rare infrequent occasions (once or twice a month)
after upgrade to 5.4 I get 500+ per day.
Google has suggestions for
|logging
   category lame-servers null; ;
;

|however this strikes me as severe overkill as it will mask genuine 
problems.
Anyone else noticed this?
Suggestions as to why or what is causing?
Thanks
Rob

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