ya know, i've been having similar problems with my Linksys BEFSX41 router as well.
I just recently got the latest firmware drivers and it seems to be ok for now. Are you using Comcast cable, by chance? And do the modem LEDs indicate anything about the connection being good/bad when things go haywire? I talked to a guy at comcast and he said everything looked ok at their end.... some help they are.
Check the DHCP settings of your router. Has the modem issued your router proper IP address information? Also, when you try to ping something when your connection is down, does the request time out, or does the domain name not even resolve? If it doesn't resovlve, maybe your DNS servers are being poopy.
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Greetings and salutations.
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