snapshot agent having the error message : The specified network name is no longer available

hi folks:

 Our snapshot replication is on a cluster server. Recently, I start to see errors from snapshot agent

Error message below:

Error messages:

Message: The specified network name is no longer available.
Stack:    at Microsoft.SqlServer.Replication.Snapshot.SqlServer.NativeBcpOutProvider.ThrowNativeBcpOutException(CConnection* pNativeConnectionWrapper)
   at Microsoft.SqlServer.Replication.Snapshot.SqlServer.NativeBcpOutProvider.BcpOut(String strBcpObjectName, String strBcpObjectOwner, String strBaseBcpObjectName, Boolean fUnicodeConversion, String strDataFile, String strLoadOrderingHint, String strWhereClause, Boolean useTableLockHint, Int32 bcpFileFormatVersion)
   at Microsoft.SqlServer.Replication.Snapshot.SqlServer.BcpOutThreadProvider.DoWork(WorkItem workItem)
   at Microsoft.SqlServer.Replication.WorkerThread.NonExceptionBasedAgentThreadProc()
   at Microsoft.SqlServer.Replication.AgentCore.BaseAgentThread.AgentThreadProcWrapper() (Source: MSSQLServer, Error number: 0)
Get help: http://help/0

Does that mean the drive snapshot files sits on has some issue? how to confirm it? 

 Thanks

 Hui

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