Today I received an update to the WordPress blogging engine itself, from my Linux Package Manager. This will have caused some disturbance to anybody trying to fetch my site between 11h35 and 11h55 this morning.
Also, this was a major update, so that I also needed to clear my cache. This means that until people have downloaded pages several times, the responses of my server may be a bit slow.
I apologize for any inconvenience.