I have a Netgear wndr3400 router and for some reason once in awhile i will lose bandwidth, my connection will go from the normal 5mb down to 1.5mb or even lower and either rebooting the router or the modem fixes it for awhile.
The one computer on the network that is directly connected to the modem has no lose of speed. Its just the wireless network. Ive noticed that the drop of speed seems to happen after another computer logs onto the router and then off again, especially after using my Ipod. After using my ipod the connection is almost guaranteed to drop and only rebooting the router or modem fixes the bandwidth again for other computers.