Simulink: Exception in thread "ROS Executor Thread": java.lang.​OutOfMemor​yError: Direct buffer memory

I use simulink connect with ROS. However simulink always reported error as below after a while ( about 2400 seconds)

Exception in thread "ROS Executor Thread": java.lang.OutOfMemoryError: Direct buffer memory
	at java.nio.Bits.reserveMemory(Bits.java:694)
	at java.nio.DirectByteBuffer.<init>(DirectByteBuffer.java:123)
	at java.nio.ByteBuffer.allocateDirect(ByteBuffer.java:311)
	at org.jboss.netty.channel.socket.nio.SocketSendBufferPool$Preallocation.<init>(SocketSendBufferPool.java:158)
	at org.jboss.netty.channel.socket.nio.SocketSendBufferPool.<init>(SocketSendBufferPool.java:40)
	at org.jboss.netty.channel.socket.nio.AbstractNioWorker.<init>(AbstractNioWorker.java:123)
	at org.jboss.netty.channel.socket.nio.NioWorker.<init>(NioWorker.java:44)
	at org.jboss.netty.channel.socket.nio.NioWorkerPool.createWorker(NioWorkerPool.java:34)
	at org.jboss.netty.channel.socket.nio.NioWorkerPool.createWorker(NioWorkerPool.java:26)
	at org.jboss.netty.channel.socket.nio.AbstractNioWorkerPool.<init>(AbstractNioWorkerPool.java:58)
	at org.jboss.netty.channel.socket.nio.NioWorkerPool.<init>(NioWorkerPool.java:29)
	at org.jboss.netty.channel.socket.nio.NioClientSocketChannelFactory.<init>(NioClientSocketChannelFactory.java:149)
	at org.jboss.netty.channel.socket.nio.NioClientSocketChannelFactory.<init>(NioClientSocketChannelFactory.java:114)
	at org.ros.internal.transport.tcp.TcpClient.<init>(TcpClient.java:71)
	at org.ros.internal.transport.tcp.TcpClientManager.connect(TcpClientManager.java:67)
	at org.ros.internal.node.topic.DefaultSubscriber.addPublisher(DefaultSubscriber.java:158)
	at org.ros.internal.node.topic.UpdatePublisherRunnable.run(UpdatePublisherRunnable.java:73)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

Here is my simulink model, include one rospublisher (geometry_msgs/Point) and two rossubsciber (geometry_msgs/PointStamped, geometry_msgs/PoseStamped)