WTR54GS Intermittent failure mode

I have a WTR54GS and have used it successfully for many years (about 5 years) as a travel router.  For the most part it has worked like a charm.
Recently it has exhibited a strange problem.  It will suddenly *stop* working as a wireless router, and the lights flash in a rhythmic pattern with about a 2 second cycle time.  I can't figure out what causes this, or what to do about it.  The big security button, which is normally an amber color in normal use will flash white every two seconds, and the other lights flash at different, regular times.  It is clearly displaying some sort of distress code, but I don't know what it means.
It will, however, sometimes fix itself.  I left it running all night without problem, but then about 8 in the morning, it suddenly goes into this mode.  At that time it becomes undetectable as a wireless network -- it no longer appears in the windows wireless lan list.  I sat and wateched, and about 10 minutes later it stops doing that, and becomes a wireless lan again.  At other times I have unplugged it, and plugged it back in.  Sometimes when you plug it back in, it works, and sometimes it continues in the failure mode.  It is not overheated ... I have unplugged it for long periods (e.g. 1 hour) and found it still failing when plugging it back in.
Right now, however, it is working fine, and I am submitting this message using it in wireless mode.
I have firmware version 1.0.15 which is the latest version listed on the Cisco site.
Does anyone have any idea what the flashing lights means?  OR what to do about it when it happens?

Sounds like it's dying. You can try upgrading/reflashing the firmware and resetting the router.
The box said windows xp or better... So I installed Linux!

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