This issue is caused by Windows File Sharing service. It will auto disconnect network drive if let the computer idle for more than 15 min.



The fix :


  1.  Open Registry Editorby Click Start, click Run, type regedit
     
  2.   Locate and then click the following key in the registry:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters 

  3.  Please add and set both autodisconnect and KeepConn keys like the pic below if they are not exist on all of the computers running Ocelot.

     

To verify the changes:

Before the change:


After the change:


Reference:

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 https://support.microsoft.com/en-au/help/297684/mapped-drive-connection-to-network-share-may-be-lost