Whenever I try joining any multiplayer server, the game first says that I connected, then it says I disconnected, and lost contact to the server. It also says Login failed
I really like the game, what do I do?

Sometimes, it just says Not Connected

Considering it says "login failed"

I'd say double check your username and password ingame and on the forum incase you're getting it wrong.

Whenever it says "Not Connected" you should also see an error message in the chat.

Try checking your login data first, if it still gives you an error then post here letting me know which error it gives and we can work from there.