By curious coincidence, we had a power outage Monday that lasted over an hour. Afterward, my SMS-1's light was on. I turned the light off, and Tuesday or Wednesday night it was on again (likely due to a brief mid-day outage while we were at work). I just hopped into my SMS-1's System Response and System Setting menus, and all of my settings are intact. I think that the light status setting is just a bit flaky.