Defina a pasta de rede em questão como "Trabalhar off-line":
Do site de ajuda do Windows da Microsoft :
Open the network folder that contains the files you have made available offline, and then, on the toolbar, click Work offline. This button appears only if you have already made this folder available offline.
When you are finished working with the files offline and want to begin working with the files in the network folder again, click Work online on the toolbar. This will sync any changes you have made offline with the files on the network.