dns server stopped resolving to my ip: need help finding out why?

I have a server which acts as its own dns server; I set up bind to resolve to my ip :
i have a few other sites and email running on this machine..
when I test with
dig solunatec.org
or dig solunatec.org axfr
all seems to work fine and has been for the last 8 months or so since i set it up, suddenly it just stopped resolving to its name out there somewhere in the dns server world..I dont know where to start trying to figure out what is going wrong, i called comcast my static ip providor and they could not help or give my any information as to why although I figure its one of there own dns servers...
my server is:
ns1.solunatec.org / i only have one..
my other domains that use solunatec.org as their dns server keep working though ??? how is this possible? this was discovered about 10 hours ago...
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Check with the company you bought your domain. they keep track of ur domain name

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solunatecAuthor Commented:
yes, its odd my domain was expired but what i dont understand is that when I looked it up in whois database i did not see the date in their database as expired??? in the mean time had to track down my reg. number and password for my registrar but yes it was expired...
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