I have a TL-SG1016D - TP-LINK 16-Port Gigabit Ethernet 10/100/1000 switch. We have 5 computers and a laptop. All 6 computers have a 1000 Mbps network card. I have cat6 cable run to all 6 computers. 4 of the computers are in the main office, they all get 1000 Mbps. However, one machine in a more...