It's usually a known error if you're constantly disconnecting from CF. Usually it's a result of a glitchy client start-up. Try doing the log-in, go to clan server, stay there for 5-minutes, and try going to the normal servers. Usually the UK clan server works.
You could try a re-boot or a fresh client but it seems you've done that already.
Let me know if you're still having trouble. Email me and try starting clients without injecting hacks if you are injecting.