Please consider that a major server update---like the one we're currently going through---can require a number of "Wizzley downs" over the course of several days (or weeks).
Believe us, we try to do our best to minimize these down times, and to schedule them during those times when we have the least amount of traffic (US night).
In order to avoid sending your traffic to non-accessible articles, it's probably a good idea to wait on major promo efforts for the next couple of weeks, or so.
Again, we're very sorry for the inconvenience and even sorrier for the lost traffic during our outages. Hans and Simon work around the clock, and my life expectancy has dropped to 61. (I'm 63.)
Thanks so much for your understanding.