I checked your site and it seems that there is something strange going on with our browser validation system.
Normally, it should run the security check once, set the cookie, and that cookie should let you download all the assets needed to render the page. But for some reason, it sometimes loads with wrong parameters first, resulting in all other requests for assets being blocked due to not having the right cookie.
I suspect that this may be an issue on our end, so I’ll have someone look into this.