I have a cable modem for my computer. I also have a wireless router for my brother's laptop. Just yesterday, the internet was going haywire. It would work for 5 seconds and then the icon of the 2 computers on the bottom right of the task bar says Local Area Connection: A network cable is unplugged. It would continuously do that and i couldn't use the internet properly. I called Optimum Online to ask what was going on. They said it was a router problem. They said that something triggered the firewall in my router and that was causing the internet to go haywire. Ive tried resetting the router, ive tried turning everything off, and i tried a full computer virus scan. No viruses were found. After restarting everything, it still didnt work. The only way i can get the internet to work is if i only use the modem. The problem with that is that my brother cant get internet service on his laptop without the router. Does anyone know what i can do to fix the router problem? I dont know how to disable the firewall. I have a D-Link router. The model is Dl-614+. Thanks in advance.