The Mozscape Index update yesterday includes even fewer urls, root domains, subdomains and total links than the previous Index from May 5th. You can compare the size of the Indexes on the Mozscape API Updates page. Most likely, you've built additional quality/relevant links as you have mentioned, but with the smaller Index these new links, and even previously indexed links, are not being picked up. Therefore, less links are being used to calculate your domain authority score. I would say the drop in your Domain Authority is due to the size of the index. Try checking out your competitor's sites to see if their domain authority dropped as well. I know mine went down slightly yesterday. You don't have anything to worry about, just keep earning quality links. I know it is tough to see your domain authority drop when you work hard to earn/build links, but the data used from one Index to the next has not been consistent, so don't worry too much about the increase/drop in domain authority from one index release to the next. If anything, track your domain authority over time and compare it to the size of the index to get a better idea of how your link building is performing. Unfortunately, that is the best answer I can give at this time.

I seem to have the same issue on my site. I get a sudden influx of visitors within minutes all coming from direct traffic. How did you discover the traffic was from Miami? The only identifying factor I could find in GA was that the Network Domain for the traffic was 1e100.net. Not sure how sending direct traffic would benefit a spammer.

Have you experienced an overall drop in traffic on days you get the huge spike in direct traffic? I feel like I do, maybe the high bounce rate is a problem and signal to Google?

Would be nice to block the traffic but possibly just filter it from GA to avoid skewed data if it is not affecting your site.

Have you checked your keyword rankings yet? Have they completely dropped off too? Hard to believe Google would completely drop your site overnight. Maybe there is an issue with your analytics tracking code being removed when you switched your website's theme. Are you seeing other traffic in GA?

Regardless, it looks like you've got a decent amount of broken links & 404 errors on your site. I doubt Google would kill your traffic over that, but it wouldn't hurt to fix these items so that once you're back online the Google Bot is not tripping over broken links.