This thing has been 100% reliable for years. Firmware up-to-date. However, last night I unplugged the power for a few hours (as I occasionally do) and when I powered it back up there was no front light. No amber, nothing. The little green lights on the ports blink so I know it's getting power. But no wifi, routing, or switching. Pressing the reset button does nothing. Not too concerned as I have spare devices but it's interesting how it just died. I'm wondering how it died and if it's salvageable. Any thoughts?