Check whether your site/CDN/ISP has a path MTU discovery problem.
I'm having lots of trouble connecting to your site using a dual-stack (IPv6 and IPv4) connection. It can take as many as five attempts for things to start loading and seeking is hit-or-miss (mostly miss). Disabling IPv6 (which otherwise works very well) helps, but this is no solution going forward.
Check whether anything on your side might be blocking ICMPv6 "packet too big" messages. A lot of admins seem to consider ICMP invariably evil, and thus block it entirely, creating problems like that (which is why path MTU discovery is utterly broken in IPv4 world, and hacks like MSS clamping are used).
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A lot of video seeking issues, video 'not found', bad gateways lately.