I've watched the console closely, and have seen nothing, but at certain intervals, or events with an NPC from MinecraftComesAlive. A random player, or all but one player will be disconnected from the server with the message: A Fatal error has occurred. I have upgraded the server's RAM and seems to me it isn't the server rather either a Bug, or Glitch. I'm using the newest update of MCA (rather easier to say the newest release for 1.7.10). If you would like to see the server send me an email, and I can link you over. Then you can see the Error yourself. If you also would like some screen shots, and played events I can try to pull them from the server.
Email: [email protected]