Server disconnecting players every few minutes.

This had actually only just started up earlier today... My friends and I were all playing on our server, and every few minutes everyone will get disconnected. After I had gone offline, my friends continued to mess about, and on our skype group, they continued to complain about the server crashing, and continued to do so, even after I gave them the command to delete one of the Multiverse portals to see if it was that plugin doing it, and we debunked it that it wasn't, and I watched the console until they disconnected and the server is apparently not actually turning off, it's just booting all of us. I'm unsure if this is a bug with one of my plugins, or if it is a frequent bug happening to other people with any server as well.

And I apologise ahead of time if this is in the incorrect forum section, I'm not normally the best when it comes to forum navigation.

Thanks for the move, and no, there aren't any error messages. It just disconnects us and prevents us from entering the server for a good minute or two. The console messages display all the users as just simply disconnecting or timing out.

We had waited about a day to see if it would fix itself, and it appears the frequent crashes no longer occur, but I will continue to keep my eyes peeled, though I mean that in a metaphorical sense, and not a literal one.