"kicked by Operator"

I had an issue where I'd get kicked from my own server. Around noon I logged in, and it repeatedly kicked me from my own server and now my friends are experiencing the same. They log in, and several seconds later they get kicked. I have plenty time left in my server, and all friends are OP. I don't pay what I do so I can't play, this isn't fun/fair. Please do help resolve this issue!