My site, http://www.tipsdb.com, failed to validate again. Could you help to check why? I didn't change anything.
Did you make any DNS changes recently? There seems to be some funkiness with that domain's name servers (sometimes the IP address resolves, and sometimes it doesn't). A quick check over here shows some potential issues with your name servers you may want to check out: http://www.dnsreport.com/tools/dnsreport.ch?domain=tipsdb.com