This is just routing maintenance. Nothing to worry about. The site was only down a short while. As a web developer I can tell you it's pretty normal to do maintenance on a site from time to time. It doesn't mean it's hacked or anything like that. As for the 'tumble' you're referring to, it's also normal for the price of crypto's especially active ones to fluctuate in price. Over the last month it's grown in value by nearly 50% from around $200 per BCC to holding around $300 per BCC. This is far from a tumble.