https://www.cnbc.com/2018/07/19/amazon-internal-documents-what-caused-prime-day-crash-company-scramble.html

Amazon failed to secure enough servers to handle the traffic surge on Prime Day, causing it to launch a scaled-down backup front page and temporarily kill off all international traffic, according to internal Amazon documents obtained by CNBC.

And that all took place within 15 minutes of the start of Prime Day — one of Amazon's biggest sales days every year.