"How do I know when MxM is down?"
We have our own service status page. It monitors MxM minute-by-minute, 24/7, and will indicate any outages - along with any error codes and full history. You can check on the status of our website (and its many branches) at any time by clicking here.
Once you're there, subscribe to updates by clicking on the green bell icon in the upper-right corner - and entering your email address.
By clicking any of the services on the list, you can access deeper information such as "response time" (how quickly the server responds to requests). This is useful for figuring out if site performance issues are happening on our end - or yours.