Our order system crashed during a big sale and I had to fix it

It happened on Friday morning right when our spring sale went live. The whole checkout page just stopped working for about 20 minutes. I had to call our web host, Bluehost, and get them to restart our server while I posted a quick update on our social media. We still lost about 15 orders before it came back up. Has anyone else had to deal with a server crash during a peak sales time?