Cant get onto the server!

Me and Ickli are having a problem of getting onto the server. We type in /login and our pass and it crashes, sometimes we cant even type / and it freezes and crashes. When i go onto one of my singleplayer worlds minecraft works fine its just on multiplayer. If you know what is going on please tell me or if you are having the same problem comment about it too! Its annoying and i dont know what is going on.

I'm unable to do anything on the server. i join and i can stand and look around before the register feature tells me i have to login. when i open the chat menu i cna type the first few letter ( /logi ) and then the game freezes and crashes. Doesn't happen on any other MP servers.

Ijust want everyone to know that i've not left the server and my Moderator SSpot is NOT free!