ExtendTCP service times out for unknown reason

In our coherence setup, clients restart the ExtendTCP (and the corresponding NamedCaches) after logging a request timeout (see log excerpts below). However, the network itself shows no indication of errors or lags, there was no full GC on either the client or the server, and the cache itself is purely in-memory (not database-backed). So, we cannot see a reason as to why the proxy should take longer than 5 seconds (the request timeout we configured) to respond. Is there perhaps something else that could cause these timeouts ?
thanks,
Tom
Client log excerpt (everything related to coherence in the logs for this event):
com.tangosol.net.messaging.ConnectionException: did not receive a response within 5000 milliseconds
at com.tangosol.coherence.component.comm.RequestStatus.waitForResponse(RequestStatus.CDB:74)
at com.tangosol.coherence.component.comm.Channel.request(Channel.CDB:95)
at com.tangosol.coherence.component.comm.Channel.request(Channel.CDB:1)
at com.tangosol.coherence.component.net.extend.RemoteNamedCache.get(RemoteNamedCache.CDB:11)
at com.tangosol.coherence.component.util.SafeNamedCache.get(SafeNamedCache.CDB:1)
at com.tangosol.net.cache.CachingMap.get(CachingMap.java:486)
Oracle Coherence GE 3.3/387p4 <D5> (thread=TcpInitiator:EventDispatcher, member=n/a): Stopped: TcpInitiator
Oracle Coherence GE 3.3/387p4 <Info> (thread=Frontend-1, member=n/a): Restarting NamedCache: catalog
Oracle Coherence GE 3.3/387p4 <Info> (thread=Frontend-1, member=n/a): Restarting Service: ExtendTcpCacheService
Oracle Coherence GE 3.3/387p4 <D5> (thread=Frontend-1, member=n/a): Started: TcpInitiator(Running=true, ThreadCount=0, PingInterval=60000, PingTimeout=30000, RequestTimeout=5000, ConnectTimeout=10000, RemoteAddresses=[<list of proxies>], KeepAliveEnabled=true, TcpDelayEnabled=false, ReceiveBufferSize=0, SendBufferSize=0, LingerTimeout=-1)
Oracle Coherence GE 3.3/387p4 <D5> (thread=Frontend-1, member=n/a): Opening Socket connection to <remote address and port>
Oracle Coherence GE 3.3/387p4 <Info> (thread=Frontend-1, member=n/a): Connected to <remote address and port>
Corresponding excerpt from the proxy that this client was connected to:
Logger@9215220 3.3/387p4 Coherence (thread=ExtendTcpProxyServiceWorker:8, member=18): Closed: Channel(Id=542371789, Open=false)
Logger@9215220 3.3/387p4 Coherence (thread=ExtendTcpProxyServiceWorker:8, member=18): Closed: Channel(Id=842600564, Open=false)
Logger@9215220 3.3/387p4 Coherence (thread=ExtendTcpProxyServiceWorker:8, member=18): Closed: Channel(Id=1417697827, Open=false)
Logger@9215220 3.3/387p4 Coherence (thread=ExtendTcpProxyServiceWorker:8, member=18): Closed: Channel(Id=0, Open=false)
Logger@9215220 3.3/387p4 Coherence (thread=ExtendTcpProxyServiceWorker:8, member=18): Closed: TcpConnection(Id=0x00000116AE52DB610A10235B875BF9499EC9D320F572E089C925E449C4108F3A, Open=false, LocalAddress=<local ip and port>, RemoteAddress=<remote ip and port>)
Logger@9215220 3.3/387p4 Coherence (thread=TcpAcceptor:TcpProcessor, member=18): Released: TcpConnection(Id=0x00000116AE52DB610A10235B875BF9499EC9D320F572E089C925E449C4108F3A, Open=false)

Tom,
I would strongly suggest upgrading to the supported GA version (v3.3.1b389) and re-run the tests. If the problem re-surfaces, please send the entire log file to Coherence support at Oracle Metalink.
Regards,
Gene

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