I have a five-year-old router with four computers running on it (three are wireless). The router is a linksys WRT54G version 1.02.0. I have been trying to enable WPA on it and the router has the option listed under the wireless security section. At first, the computers are able to connect to the network, but after about ten minutes none of the computers are able to connect. Does anyone know why this is? Should I get a better router?