socket.c:4524: unexpected error

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Hello,

I've been seeing more and more of the following errors in all of our 
name servers running Bind 9.4.3-2 on CentOS 5.3 servers:

May 8 11:00:44 ns3 named[7502]: socket.c:4524: unexpected error:
May 8 11:00:44 ns3 named[7502]: 22/Invalid argument
May 8 11:00:45 ns3 named[7502]: socket.c:4524: unexpected error:
May 8 11:00:45 ns3 named[7502]: 22/Invalid argument
May 8 11:00:45 ns3 named[7502]: socket.c:4524: unexpected error:
May 8 11:00:45 ns3 named[7502]: 22/Invalid argument
May 8 11:00:45 ns3 named[7502]: socket.c:4524: unexpected error:
May 8 11:00:45 ns3 named[7502]: 22/Invalid argument
May 8 11:00:50 ns3 named[7502]: socket.c:4524: unexpected error:
May 8 11:00:50 ns3 named[7502]: 22/Invalid argument
May 8 11:00:51 ns3 named[7502]: socket.c:4524: unexpected error:
May 8 11:00:51 ns3 named[7502]: 22/Invalid argument
May 8 11:00:51 ns3 named[7502]: socket.c:4524: unexpected error:
May 8 11:00:51 ns3 named[7502]: 22/Invalid argument
May 8 11:00:52 ns3 named[7502]: socket.c:4524: unexpected error:
May 8 11:00:52 ns3 named[7502]: 22/Invalid argument
May 8 11:00:52 ns3 named[7502]: socket.c:4524: unexpected error:

thx,

SW