This is because James (!) Is lagging the server (He is saying it itself xD) When the server gets laggy, it will get restarted to get the lag removed Well, maybe it's someone else, but I think that it will be gone very quick ~Jimmeh
James posted a thread, he killed all his animals, I don't think it's him. Lag is sometimes hard to trace. Sorry for the inconvenience.
I would be fine with it but the issue is that whenever the server restarts it almost "rolls back" any blocks I've placed and puts them back in my inventory :s
I think that has to do with the fact the server saves itself about a minute before the reset, and not directly before it.