DNS Resolution Problem (sometimes, randomly)

OK, I know most people hide their IP's and Domain when asking for help, but I don't know a good way to explain mine without including them.

I have 2 domains on a machine currently, one domain is also used for the 2 nameserver addresses (Yes I know, same machine - bad - but this isn't mission critical, and I'm cheap) - ns1.bretthoerner.com, ns2.bretthoerner.com

Both domains have the same named conf except for the obvious domain name change, ie:

Code: 
$TTL 3D
@       IN      SOA     ns1.bretthoerner.com. hostmaster.bretthoerner.com. (
                        199802151       ; serial, todays date + todays serial #
                        8H              ; refresh, seconds
                        2H              ; retry, seconds
                        4W              ; expire, seconds
                        1D )            ; minimum, seconds
                                        NS      72.36.191.186
                                        A       72.36.191.186
localhost               14400   IN      A       127.0.0.1
www                     14400   IN      A       72.36.191.186
ftp                     14400   IN      A       72.36.191.186
bretthoerner.com.       14400   IN      MX      0       bretthoerner.com.
mail                    14400   IN      CNAME   bretthoerner.com.
augur                   14400   IN      A       72.36.191.186
Code: 
$TTL 3D
@       IN      SOA     ns1.bretthoerner.com. hostmaster.postfarm.net. (
                        199802151       ; serial, todays date + todays serial #
                        8H              ; refresh, seconds
                        2H              ; retry, seconds
                        4W              ; expire, seconds
                        1D )            ; minimum, seconds
                                        NS      72.36.191.186
                                        A       72.36.191.186
localhost               14400   IN      A       127.0.0.1
www                     14400   IN      A       72.36.191.186
ftp                     14400   IN      A       72.36.191.186
postfarm.net.           14400   IN      MX      0       postfarm.net.
mail                    14400   IN      CNAME   postfarm.net.
augur                   14400   IN      A       72.36.191.186
Anyways, all the DNS settings on my server and the registrar have been set for a week and half, nothing should be changing anymore. The problem is, www.bretthoerner.com always works, always, no problems at all. But www.postfarm.net doesn't resolve half of the time, like right now (this morning) - yesterday it resolved fine, and right now other users in different areas of the US are still resolving fine (caches? dunno) I cannot figure out why www.postfarm.net would not be resolving, it's definitly DNS because I can't ping - it isn't as if apache is refusing the connection, it isn't even getting there.

I've tried using dnsstuff.com and both of them look fine from what I see... can anyone give me some guidance/ideas?

 

 

 

 

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