Server Problem in version 3.9.1 [Keeps Disconnecting]

Hi Guys!

I recently setup a new server having the latest release of 3.9.1 (Feb 2014). Experiencing client disconnections Details of my server:

1.) JAVA

java version "1.6.0_30"

OpenJDK Runtime Environment (IcedTea6 1.13.1) (rhel-3.1.13.1.el6_5-x86_64)

OpenJDK 64-Bit Server VM (build 23.25-b01, mixed mode)

2.) OS: CentOS 6.5 64-bit

3.) VM Specs:

8GB RAM

8 core processor

Openfire Specs:

102 user accounts

6 groups

4.)stderror.log

    at org.jivesoftware.openfire.group.DefaultGroupProvider.getGroup(DefaultGroupProvi der.java:116)

    at org.jivesoftware.openfire.group.GroupManager.getGroup(GroupManager.java:330)

    at org.jivesoftware.openfire.group.GroupManager.getGroup(GroupManager.java:309)

    at org.jivesoftware.openfire.plugin.PacketFilter.packetToFromGroup(PacketFilter.ja va:119)

    at org.jivesoftware.openfire.plugin.PacketFilter.sourceDestMatch(PacketFilter.java :86)

    at org.jivesoftware.openfire.plugin.PacketFilter.findMatch(PacketFilter.java:36)

    at org.jivesoftware.openfire.plugin.PacketFilterPlugin.interceptPacket(PacketFilte rPlugin.java:77)

    at org.jivesoftware.openfire.interceptor.InterceptorManager.invokeInterceptors(Int erceptorManager.java:239)

    at org.jivesoftware.openfire.session.LocalSession.process(LocalSession.java:280)

    at org.jivesoftware.openfire.spi.RoutingTableImpl.routeToLocalDomain(RoutingTableI mpl.java:306)

    at org.jivesoftware.openfire.spi.RoutingTableImpl.routePacket(RoutingTableImpl.jav a:234)

    at org.jivesoftware.openfire.server.OutgoingSessionPromise$PacketsProcessor.return ErrorToSender(OutgoingSessionPromise.java:299)

    at org.jivesoftware.openfire.server.OutgoingSessionPromise$PacketsProcessor.run(Ou tgoingSessionPromise.java:226)

    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146)

    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)

    at java.lang.Thread.run(Thread.java:701)

5.) I used MySQL server for the DB (not the embedded DB)

6.) Usually I stop and restarts openfire service then it refreshes BUT disconnects after a couple of hours. Lastly rebooting the server refreshes it all

Hope you can help

Regards

Jessie