Site running slow

[whoami]

Is anyone else having problems this evening?

Intermittently, I either get no response or this error;

502 - Web server received an invalid response while acting as a gateway or proxy server.
There is a problem with the page you are looking for, and it cannot be displayed. When the Web server (while acting as a gateway or proxy) contacted the upstream content server, it received an invalid response from the content server.