Builds getting queued/retired

Build Environment
1

Since Friday, all my builds are either getting queued or retired. The error I get reads:

Looks like we had a bug in our infrastructure, or that of our providers (generally GitHub or AWS). We should have automatically retried this build. We’ve been alerted of the issue and are almost certainly looking into it, please contact us if you’re interested in the cause or if the problem persists.

I’ve tried to cancel and rebuild, but it doesn’t fix it. The only change I made in my current build was that I edited the circle.yml file to add some environment variables:

machine:
  python:
    version: 3.5.1
  environment:
    var_1=$var_1
    var_2=$var_2

Any help would be appreciated Thanks!