If nothing else helps open MC in a window, Hit CTRL,ALT, DEL.. open Task Manager/ Networking TAB. Start a show from Netflix in MC and watch the network meter... When the show drops off or "Locks up" does the connection drop out?
If so try this below and try it again..
If you open device manager and double click on your network adapter. On the power management tab is a check box that says allow the computer to turn off the device to save power. Uncheck that and see if that makes a difference... usually this shouldn't cause an issue but you may have gotten an updated buggy driver..