I have a 308ft cat5 cable running from a cisco 2650 to a small linskys giga-bit 5 port switch then to 2 computers. Every morning both computers attached to the switch can't find the network. The IPCONFIG reports "No Media Detected". All cables have been tested and came back OK. After about an hour of being logged into Windows the connection starts like nothing ever happened. If the computers are on but waiting at the login screen the connection will not work. The port light on the Cisco for that port is off. also if the computers are left they remain connected to the network.