FC 5 named service seems to "go away"

[Richard England]

I have a set of 3 Linux boxes,  LaptopFC6, DesktopFC5, and DesktopFC6.   
On the two FC6 machines named is no longer a services ( I'm not sure who 
took it's place, since I'm a networking neophyte) but everything seems 
to be working to allow me access to the net via my DSL modem/router and 
to each of the machines  from each other....

. . . except  (you knew there had to be an exceptions, else why would I 
bother with this)

DesktopFC5 (didius) periodically looses contact with the (net)world.  It 
can't be pinged, I can ssh to it, and I can't get to an external site,  
at least by name. When I discovered this I fell back on my Unix 
experience and restarted and named and, voila!, everything was back in 
order.

I have NetworkManager running on all three machines.

I keep all three of them as close to current in updates as I can.


Can anyone tell me why named periodically goes into limbo?  or tell me 
how I can start to investigate this?

/var/log/messages

seems to show the following when I can no longer use the name of the 
site/machine

Jan 16 23:01:03 didius NetworkManager: <WARNING>         
add_ip4_config_to_named (): Could not set forwarders for zone '.'.  
Error: 'No reply within specified time'.

When I restart named  I get the following in /var/log/messages

Jan 16 23:00:38 didius named[2410]: shutting down: flushing changes
Jan 16 23:00:38 didius named[2410]: stopping command channel on 
127.0.0.1#953
Jan 16 23:00:38 didius named[2410]: no longer listening on 127.0.0.1#53
Jan 16 23:00:38 didius named[2410]: no longer listening on 192.168.1.45#53
Jan 16 23:00:38 didius named[2410]: exiting
Jan 16 23:00:38 didius named[2532]: starting BIND 9.3.3rc2 -u named -D
Jan 16 23:00:38 didius named[2532]: found 1 CPU, using 1 worker thread
Jan 16 23:00:38 didius named[2532]: loading configuration from 
'/etc/named.conf'Jan 16 23:00:38 didius named[2532]: listening on IPv4 
interface lo, 127.0.0.1#53Jan 16 23:00:38 didius named[2532]: listening 
on IPv4 interface eth0, 192.168.1.45#53
Jan 16 23:00:38 didius named[2532]: command channel listening on 
127.0.0.1#953
Jan 16 23:00:38 didius named[2532]: zone 0.in-addr.arpa/IN: loaded serial 42
Jan 16 23:00:38 didius named[2532]: zone 0.0.127.in-addr.arpa/IN: loaded 
serial 1997022700
Jan 16 23:00:38 didius named[2532]: zone 255.in-addr.arpa/IN: loaded 
serial 42
Jan 16 23:00:38 didius named[2532]: zone 
0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa/IN: 
loaded serial 1997022700
Jan 16 23:00:38 didius named[2532]: zone localdomain/IN: loaded serial 42
Jan 16 23:00:38 didius named[2532]: zone localhost/IN: loaded serial 42
Jan 16 23:00:38 didius named[2532]: D-BUS dhcdbd subscription enabled.
Jan 16 23:00:38 didius named[2532]: D-BUS service enabled.
Jan 16 23:00:38 didius named[2532]: running

Sometimes I can go for several hours with out a problem. Other times it 
is a matter of minutes.

Any help gratefully appreciated.

~~R