They are on a Slingshot AYCE line.
They are having problems with the Internet, where as some websites work and some all together just refuse to load up.
They suspect it's me, overusing the line as it's never happened to them before. I'm sure it's not me, I also had the same problem, however I switched to an alternative DNS server on my computer, and the problem seems to have gone away for me, however the others are still having problems.
I don't want to switch the others over to an alternative DNS server, in case the alternative DNS server stops, working, or slows them down. So I'm waiting to get a response from Slingshot first, if there is a problem there, and what I can do to fix it.