Airport Extreme b/g disappearing

I'm having a problem that is really puzzling me.
I have a "dual band" network that is powered by a Time Capsule and an Airport Extreme b/g base station. The TC is configured to run n-only, which the Extreme base station is b/g compatible. The Extreme base station is connected to the TC via ethernet, and is set to Bridge mode. Most of the time this setup works fine. However every once in a while, with increasing frequency the Extreme base station is simply disappearing and I have to power cycle it by unplugging it.
I've tried downgrading the firmware to 5.6 then reapplying the 5.7 firmware and this did not help. I also tried to do a factory reset on the base station but is just won't work. No matter how many times I try it every time I plug the base station back in it still has the configs I'm trying to get rid of.
I really have no ideas left to try, and I've come up with nothing searching the Apple KB. Is it possible the base station is simply on the verge of failing? That doesn't make much sense, but the fact that I can't factory reset it does cause some concern.
Anyway, any suggestions to help stop this problem will be greatly appreciated. I think I'm going to downgrade the firmware to 5.6 again and leave it there for a while and see how that works.
Regard,
Michael

My question has not exactly been answered, but after a trip to the Genius bar I found that my current AppleCare does not cover this base station. I had forgotten the device was bought in 2003.
At any rate, I was finally able to get it reset to factory settings and loaded up the 5.7 firmware and so far it has been operating without trouble for about a week. Knock wood.
Regards,
Michael

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