A vendor I’m using recently switched servers from WP Engine to AWS. One day after the switch, the site crashed. They said the issue was a spike in traffic, but traffic was pretty average. When I questioned them, this is the response I received. "User traffic causes degradation of web services. If it happens again, we will move it to a larger instance. We are monitoring it today. There really is nothing more to say."
I’m calling BS, but wanted to get other people’s opinions on here first. This is an area that I’m not an expert in.