This is a friendly "for your information" type of post.
I think your website is using CDN from CloudFlare. Here in Canada, I recently came across "website unavailable" error several times when actually graphene-theme.com is online. Often your site goes out with CloudFlare error messages. This will have a negative impact on your site. I don't know how much traffic you get, but I would stay away from CloudFlare.
I had a lot of issues with CloudFlare CDN myself and I removed them due to the same reason.
At 10:20 AM Canadian Mountain Time, your site is off-line at CloudFlare CDN.
All the best and I hope this would help you guys out.