We’re not seeing any reason why your site would fail to load content. Your certificate is in date and has been for some time! I’m seeing no conflicting zones or records here, either.
Is the issue persistent? Have you recently made changes? Are there trends between these users who cannot use the service (common browsers, extensions etc)?
oh, that is very frustrating. Have you taken the issue up with their customer support? Are the people who are experiencing this all on the same local network? We haven’t been hearing anything of this being a widespread issue, i’m afraid. (i mean, that is a good thing, but maybe harder to troubleshoot for you.)