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Clients randomly disconnnecting

Hi im having an issue with my Xabber clients randomly disconnecting and reconnecting.
The log entries associated with the disconnections are below
Using OpenFire 4.1.6 on a Windows 7 machine which is not affiliated with a domain controller
Clients are Xabber on mobile phones

Debug Log
2017.11.09 11:45:55 org.jivesoftware.openfire.nio.NIOConnection - Peer does not offer certificates in session: org.jivesoftware.openfire.session.LocalClientSession@1851de5 status: 3 address: nurse-06@allianceallcall/Xabber_DMk8nrW0 id: 4hh28guljp presence:

Warn Log
2017.11.09 11:45:57 org.jivesoftware.openfire.nio.ConnectionHandler - Closing connection due to exception in session: (0x0000007C: nio socket, server, / =>

Help please.