Guys calm down a little.
I already explained that the two times the master went down were totally different reasons, and then it went down a third time and SamH explained that was yet another totally different reason.
So, by pure coincidence the master was affected for a few hours, 3 times in about a month, for 3 different reasons (having been near 100% for some years). They are the sort of things that happen around once a year, and this time they came in quick succession.
1) Router needed restarting
2) My fault, changing some settings
3) The ISP had some problems
It's not that shocking that an internet service can occasionally suffer a breakdown - a lot of things need to be working right, for it to actually work!
Today there was a problem with the web server. It's unrelated. The web server got a problem that it has never had before, and needed restarting. It's not related in any way to the master server. The web server's houser had a power out problem earlier this year as well.
These things happen. This is not a recurring fault that needs to be fixed.