Networking & wireless: WRT54G Frequent disconnects

WRT54G Frequent disconnects

I'm having a problem with my LinkSys wireless router WRT45G Version 8. It keeps disconnecting every few minutes and even seconds. I have upgraded to the latest firmware and tried everything from turning off the power to playing with the settings. My adapter tells me that it's connected to the router but cannot find the internet. I know the problem is not with my modem because I have resorted to connecting directly to the modem to my laptop with an ethernet cable and I've had no problems. But I need the wireless modem for my desk top in another room. When I tried connecting to my router with my desktop it would only partially load the page or not at all. So the problem is the connection between the computer and the modem. It has become really annoying lately espcially when using my Yahoo IM which seems to be the most sensitive in detecting a disconnect. It would disconnect every few SECONDS. My wireless status indicator for some reason doesn't detect a disconnects very well since when I get disconnected it still shows I'm connected.