I don't know about this but sometimes when I first launch cs and try joining jb it starts loading and kicks me with a "timed out" message.
Then I just try joining again and it's all fine, I never get kicked mid game though.
Also kolloz isn't the only one,
@Loks is always crashing when playing jb, he doesn't just get kicked, his whole cs crashes, but that might be a different issue.
If none of above suggested helps, then it's probably a server sided issue.