This has nothing to do with the Invaded Lands servers. Right now I am questioning your Wifi if whether or not you're in McDonalds or maybe you just need a new router... Yikes.
Ok in all seriousness, the server shouldn't crash when you join Kit PvP. Times out, possibly because of connection or how the server is being run. Obviously you can't expect a very populated server to run amazingly all day. If it ever freezes you in hub probably restart your game, computer, closeout of some tabs or restart your internet router. And yeah otherwise you can technically fly in the hub. Because of your lag lol.
Edit: I don't know why I really went tryhard in answering this.