Is Netinfo unstable in 10.4.9 or .10 ?

[Nat!]

I have a few MacMinis that I administrate and very unfortunately  
lately from time to time, about once a week or so, the machine _can_  
be pinged but otherwise just refuses to serve.

When I look into the system log after reboot, I see messages like:

Aug  2 10:19:07 minihost DirectoryService[52]: SafeOpen::Call to  
netinfo_open was with argument domain name: .. and lasted 3 seconds  
while timeout was 3
Aug  2 10:19:17 minihost DirectoryService[52]: NetInfo connection  
failed for server 127.0.0.1/local
Aug  2 10:19:19 minihost DirectoryService[52]: NetInfo connection  
failed for server 127.0.0.1/local
Aug  2 10:19:21 minihost DirectoryService[52]: NetInfo connection  
failed for server 127.0.0.1/local
Aug  2 10:29:23 minihost DirectoryService[52]: NetInfo connection  
failed for server 127.0.0.1/local
Aug  2 10:29:25 minihost DirectoryService[52]: NetInfo connection  
failed for server 127.0.0.1/local
Aug  2 10:45:19 minihost lookupd[122]: NetInfo connection failed for  
server 127.0.0.1/local
Aug  2 10:45:19 minihost lookupd[122]: ni_statistics: Communication  
failure
Aug  2 10:47:04 minihost lookupd[122]: NetInfo connection failed for  
server 127.0.0.1/local
Aug  2 10:47:04 minihost lookupd[122]: ni_statistics: Communication  
failure
Aug  2 10:48:49 minihost lookupd[122]: NetInfo connection failed for  
server 127.0.0.1/local
Aug  2 10:49:19 minihost DirectoryService[52]: NetInfo connection  
failed for server 127.0.0.1/local
Aug  2 10:50:44 minihost DirectoryService[52]: NetInfo connection  
failed for server 127.0.0.1/local
Aug  2 11:10:39 minihost DirectoryService[52]: NetInfo connection  
failed for server 127.0.0.1/local

After a reboot everything may work fine again for a few days.
There is nothing special with these Minis. The Netinfo is only used  
for its default OSX purposes.
Nameservers are ISP nameservers.
Looking at the log it seems that the netinfo daemon just likes to go  
on strike occasionally.

Thanks for any hints.

Ciao
    Nat!
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high income and protracted unemployment,
I can assure you that nobody should enter programming
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