My plugin stops working over time.

I am making a plugin, and the commands work, and all. But after a while if you try a command it won't work. If you reload it starts to work again. I think its something in here:
SimpleCommandManager.java

Code:

public class SimpleCommandManager implements CommandManager {
    private Map<String, CrimsonCommand> commands = new HashMap<String, CrimsonCommand>();
    private Crimson core;

    public SimpleCommandManager(Crimson core) {
        this.core = core;
    }
    public void registerCommands() {
        //Admin commands
        commands.put("fakegamemode", new CommandFakeGameMode(core));
        commands.put("forceload", new CommandForceLoad(core));
        commands.put("forcesave", new CommandForceSave(core));
        commands.put("gimme", new CommandGimme(core));
        //Citizen commands
        commands.put("message", new CommandMessage(core));
        commands.put("pay", new CommandPay(core));
        commands.put("reply", new CommandReply(core));
        commands.put("wallet", new CommandWallet(core));
        //Plot commands
        commands.put("plot", new CommandPlot(core));
        commands.put("plotaccept", new CommandPlotAccept(core));
        commands.put("plotadminify", new CommandPlotAdminify(core));
        commands.put("plotcreate", new CommandPlotCreate(core));
        commands.put("plotdemote", new CommandPlotDemote(core));
        commands.put("plotdeposit", new CommandPlotDeposit(core));
        commands.put("plotdisband", new CommandPlotDisband(core));
        commands.put("plotdowngrade", new CommandPlotDowngrade(core));
        commands.put("plotexpand", new CommandPlotExpand(core));
        commands.put("plothelp", new CommandPlotHelp(core));
        commands.put("plotinfo", new CommandPlotInfo(core));
        commands.put("plotinvite", new CommandPlotInvite(core));
        commands.put("plotkick", new CommandPlotKick(core));
        commands.put("plotpromote", new CommandPlotPromote(core));
        commands.put("plotrename", new CommandPlotRename(core));
        commands.put("plotshrink", new CommandPlotShrink(core));
        commands.put("plotsize", new CommandPlotSize(core));
        commands.put("plotupgrade", new CommandPlotUpgrade(core));
        commands.put("plotwithdraw", new CommandPlotWithdraw(core));
        for (Entry<String, CrimsonCommand> commandEntry : commands.entrySet()) {
            core.getCommand(commandEntry.getKey()).setExecutor(commandEntry.getValue());
        }
    }

    public CrimsonCommand getCommand(String name) {
        return commands.get(name);
    }
}

And heres some code from the main class:

Code:

public void onEnable() {
        citizenManager = new SimpleCitizenManager(this);
        listenerManager = new ListenerManager(this);
        plotManager = new SimplePlotManager(this);
        commandManager = new SimpleCommandManager(this);
        npcManager = new MartinNPCManager(this);
        chatHandler = new SimpleChatHandler(this);
        resourceManager = new ResourceManager(this);
        materialManager = new MaterialManager(this);
        clanManager = new ClanManager(this);
        listenerManager.registerEvents();
        commandManager.registerCommands();
        

 

Is your server slowing down over time?

 

@KillerSmurf How are you detecting when they use a command?

 

I fixed it, it creates a citizen when they join. And when they leave and rejoin is when is it stops working. But i made it so it removes them when they leave. All fixed now.