Its just people have got far in the game and about to go to space and then it is just restarted???
You have to understand that CC1 is not a new pack and that those that play there now did not all start playing at the same time and is nearing end-game.
There probably have been hundreds if not thousands of people end-gaming CC in the course of the time it have been running, hence the issues with lag and broken terrain.
And Java is 100% right.. there is no point in let CC run if not reset.