I replaced the ethernet cables with brand new ones, and they continue to log off and on. In addition to new cables, the SMC is new, replaced under warranty.  The new SMC and new cables made no change. In your case, what happened after 6 months?
>
>>In relation to my two machines logging on and off so that my network
>>rarely functions, here is the log kept by the SMC router/switchbox over
>>this past week.
>
>My network did the same thing with similar router log entries.   I
>discovered after many weeks of troubleshooting and switching hardware and
>routers, that I had a very intermittent connection from the router to one
>of my machines.  Funny thing was that it affected all 4 of my
>machines.   Apparently the router accumulated errors and would log machines
>off the network and sometimes even log the router off my cable
>modem.  After I replaced the single bad cable connector, all machines
>worked have perfectly on the network for almost 6 months.
>
>


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