Need advice on sudden wireless loss with Buffalo AirStation WHR-G54S

Our two MacBooks suddenly can't pick up a signal from our Buffalo wireless router, though the router's Ethernet WAN port works fine. When I unplug the power for 3 seconds for a diagnostic, I get a red light that the manual says indicates a RAM problem.
Where should I go from here? Power down the router for a minute or so, then reboot it? Reconfigure my network over again? Buffalo's support site offers little guidance.

So I slept on it and in the morning the router was working normally, network available to both MacBooks as if nothing had happened. Go figure.

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