It's not regular for windows to freeze the whole system when clicking on network drives. If the network drive is not accesible or network is slow, freezes only the part where the icon is present. i.e. if icon is on desktop - desktop will freeze, but not taskbar. I will sugest not use windows shortcuts in this case but batch files with:
start \\network_computer_name_or_fqdn\share_name
Also, avoid using FQDN other tunnel.