Mine used to do that a lot when i was first around the server, it had been doing it for weeks before on others.. that's how I found [KM] It was one of the lower ping servers I could actually join for a while- but I was still reading a ping of 80-100+

I found out by chance that Telewest were doing some work on the lines one day.. the next time i started up CS, magic.. pings back down to 25-30!

It used to lag horribly when I could join some servers too, so it may be something similar..

You'd think being less than a mile from their main exchange building here would help!