DNS problem please help me

Hello

I have 3 server

I registered name server for each server from 1 domain

like

dns1.domain.com
dns2.domain.com for server number 1


dns3.domain.com
dns4.domain.com for server number 2


dns5.domain.com
dns6.domain.com for server number 3


this domain.com hosted in server number 2

Now In server number 3

I have a strange problem
sites working for a while and then it can't be open

so I go to root

and see the services ( all working good )

restarting named ( named start ok )

But when I put this

for i in $(ls *.db | awk '{ print substr($0,0,length($0)-3) }'); do host $i; done

I get these error

Host server.domain.com not found: 3(NXDOMAIN)
Host dns6.domain.com not found: 3(NXDOMAIN)
-----------------


dns5.domain.com Not found in the result I don't know why ???
-----------------

and I see the DNZ zone for these and found it is ok

-----------------

But when I

/scripts/restartsrv named

root@cp2 [/var/named]# /scripts/restartsrv named
Waiting for named to restart..............finished.

named 6713 0.0 0.3 32168 3156 ? Ssl 12:33 0:00 named-wrapper -u named

named started ok
Jul 21 12:33:55 cp2 named: named shutdown succeeded
Jul 21 12:33:55 cp2 named: named-wrapper startup succeeded


I get only the above with no more result

So How I can solve this

 

 

 

 

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