Netflix streaming is down. Has been for a good 30-45 mins from what I can tell from the Twitter stream. They know about the issue, they're working on it, but they're not alerting the many, many, MANY of their customers that still don't know about this yet through the one place you can almost guarantee all of them will go: their website.
To ensure good UX, you can't just design it and then walk away. You need to make sure you have the systems in place to respond to unanticipated events. You don't have to fix it before anyone notices or even be able to anticipate every event ... you just need to expect the unexpected and be amongst the first to alert your audience when it happens.