My internet access keeps dropping!!! Help

My ISP is comcast and i am running a lynksys modem and WRT54G router.  Desktop on a cable to the router and 2 laptops and another desktop hooked up wirelessly.  Things will run beautifully for awhile and then internet access will just drop - for both the desktop and all wireless nodes.  Internet light on the router is still flashing like its ok, but its down.  I have to shut down router/modem and dekstop to re-establish  internet.  Also, when internet goes down, even though internet light on router is flashing i cant get to it with the 192.168.1.1 address.  Ideas?  Im losing my mind troubleshooting this!  Thanks.
Husker

try to connect your computer directly to the modem....
if its still giving you the same problem verify yOur connection from your internet service provider...
if its giving a goOd connection the firmware on your router might need to be updated...
hOpe this helps...  

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    Upstream
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