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Just a quick note that Google has recently said they ignore links from UpDowner already.

Hi Joshua, You are essentially correct, but it could be a number of factors. Off the top of my head, and this is by no means a complete list of possibilities, the reasons for a loss of DA could be caused by: As you stated, losing links. It's estimated that each year over 50% of the entire web "disappears". Most of this is junk, but it happens to good links as well For one reason or another, Linkscape didn't find certain links during it's last crawl of the web. They may reappear during the next update. The sites linking to you lost Domain Authority themselves. This would effect your score Natural changes in Linkscape from update to update. SEOmoz is constantly improving how it crawls the web (and sometimes there's some rough spot around the edges) which causes natural fluctuation in link metrics. When this happens, it's best to use DA not as a historical measure of your own site, but as a competitive measure against your competitors. If your DA fell, it's possible your competitors DA fell as well and you are just as strong. More than likely, it's a combination of several factors. Usually, it's nothing to worry about unless you see it correspond to a traffic drop as well. Hopefully your DA will be back up during the next update.

Thanks guys, I appreciate the feedback.