What IP is it losing?
Check to make sure your modem, router and wireless devices are not trying to use the same IP.
I have the ip addresses of the network computers on the DHCP Reservations List set for the ip addresses never to expire. I assume the ip address in question could be the modem. It's a D-Link DCM-202 cable modem. The router ip address is 192.168.0.1. The ip addresses of my machines are as below:
Assigned IP Hostname Expires
192.168.0.192 Lexmark X4550 Never
192.168.0.194 Familyroom Never
192.168.0.195 Wii Never
192.168.0.196 JDH Never
192.168.0.197 OFFICE Never
192.168.0.198 Netbook Never
How do I check the modem's ip address?