I agree with TrafficProducer. Best guess would be dns issues.
Could be at the host provider (login to your hosting website control panel take a peek at the DNS see if you see the ww. in there somewhere).
Also could be at the registrant (domain provider)check in your domain name control panel, many domain registrants provide DNS services so your zones may be there. Again look for the ww.
last thing, might just be a messup with someone between the engine spider and your server not fully caching your DNS .. if that's the case it'll clear up on it's own in a few days.
Best of luck, let us know what the actual problem turns out to be.
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