MyNet N900 Central Router: the Perpetual Disconnect Machine?

WD Legacy Products My Net Networking Devices
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I have since discovered that at least a part of the problem is in fact a combination of my cable modem being in need of servicing by Comcast and my using the Google DNS servers.  Since then, I’ve narrowed down the issues with the router.  Connections are not being actively refused any longer, fortunately, but the router is still getting knocked offline at random intervals.  The intervals, however, are far less lengthy than before (the longest I’ve recorded since the changes I made was about 30 seconds).  The firmware reports itself as the most current, so I will look into performing a factory reset and reconfiguration once Comcast has fixed the cable modem’s issues.  At that point, I will post a follow-up here to update on the situation.  Thank you for your help thus far!