Bind, Plesk for Windows and Server Fail Error

[Dai]

Hi Everyone,

We're running Plesk Server Administrator 6.5 for Windows 2000 on a
server that uses BIND 9.2.2.  Every month, one of our domains stops
working.  Slowly each A record stops responding to pings and
ns-lookups, until the domain disappears completely.

The domain name (youryouthcouncil.org.uk) is set to use
ns1.hostia.co.uk [80.253.122.3] and ns2.hostia.co.uk [80.253.122.4] as
its nameservers.

this is the dns file for the domain name:

////////////////////////////////////////////////////
$TTL	86400

@	IN	SOA	ns1.hostia.co.uk. admin.hostia.co.uk. (
			1092220081	; Serial
			10800	; Refresh
			3600	; Retry
			604800	; Expire
			86400)	; Minimum

youryouthcouncil.org.uk.		 IN NS	 ns1.hostia.co.uk.
youryouthcouncil.org.uk.		 IN NS	 ns2.hostia.co.uk.
youryouthcouncil.org.uk.		 IN A	 80.253.122.3
webmail.youryouthcouncil.org.uk.		 IN A	 80.253.122.3
mail.youryouthcouncil.org.uk.		 IN A	 80.253.122.3
ns.youryouthcouncil.org.uk.		 IN A	 80.253.122.3
admin.youryouthcouncil.org.uk.		 IN A	 80.253.122.3
ftp.youryouthcouncil.org.uk.		 IN CNAME	 youryouthcouncil.org.uk.
admin.youryouthcouncil.org.uk.		 IN CNAME	 youryouthcouncil.org.uk.
www.youryouthcouncil.org.uk.		 IN CNAME	 youryouthcouncil.org.uk.
youryouthcouncil.org.uk.		 IN MX	10 mail.youryouthcouncil.org.uk.
////////////////////////////////////////////////////////////////////////

This is the zone file (named.conf)
////////////////////////////////////////////////////////////////////////
zone "youryouthcouncil.org.uk" {
	type master;
	file "C:\Program Files\SWsoft\Plesk\dns\var\youryouthcouncil.org.uk";
	allow-transfer {
		80.253.122.3;
		80.253.122.4;
		common-allow-transfer;
	};
};
acl common-allow-transfer {
	none;
};
////////////////////////////////////////////////////////////////////////

when you try to do an nslookup you get:

*** ns1.hostia.co.uk can't find youryouthcouncil.org.uk: Server failed
*** ns2.hostia.co.uk can't find youryouthcouncil.org.uk: Server failed

i ran a dns report on dnsreport.com and all i got was:
[ERROR: The parent servers do not have any NS records for
youryouthcouncil.org.uk. This DNS Report only works for domains with
nameservers (such as example.com), not hostnames such as
www.example.com, or IPs such as 198.168.12.14.]

any ideas of what is going on?

we have several other domains using the same bind dns server and they
are all working fine.

Dai