My router (Cisco WRT-320N) kept getting into what appeared to be a reboot loop. Resetting the router firmware and swapping out the router with my backup (same model and version of dd-wrt) didn't help. Eventually I discovered that if I detached the ethernet cable from the cable modem, the router would stay up until I reattached it. Since that didn't make any sense, I tried swapping out power supplies. That fixed the problem. I'm not sure why the power supply would only flake out when the router was attached to the cable modem.
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