I have the following :

Linksys Wireless Router (WRT54G)

Netgear USB (WG111v2)

Here's the problem : My internet connection will stay at a strong signal for roughly 20-30 minutes..and suddenly connection is lost. At some other point in time it will turn back on again, but the distance between the USB and the router is only one room. Was just wondering what I can do to keep a constant strong signal without losing internet connection. Thanks!