We have two desktops and two laptops attached to the internet router. One laptop is connecting perfectly, while the other is as described. This is similar for the desktops, one seems perfect but the other only manages to connect about 3/5 of the time. I cant think what the problem may be. Also, restarting the computer seems to work most of the time but this may just be coincidence.
The Laptop has a firewire net adapter and a wireless Network Connection in the Network connection folder. Both are enabled, could this be part of the problem?