I have a similar problem, but I can get a limited connection to my windows server 2012. I can access the server and copy files from it, but when I try to copy files to the server, it hangs and then eventually disconnects from the server. Once disconnected, I lose ability to do anything on the network, Internet access is gone, even though the network still says it is connected. I have to shut down and restart to get internet access back. Does not seem to care if transferring from the server, only when trying to write to the server. Still looking for a solution.