Every now and then, a beep begins to emanate from the basement. The first time it happened, I couldn't find the source, because the beep sounded only once every fifteen minutes or so. If I ignore it for a few days or a week, it begins to represent in my mind entropy's gradual nibbling away at the edges of life's order.
I finally tracked it back to the FIOS box. That's the box they install when you get Verizon FIOS service.
A similar post two years ago explains how to stop the beeping. You may be tempted to go out and buy a new battery, since that's what the beeping and the red light is signaling you to do, but that's not really necessary. The battery is slowly getting more eccentric. Fixing the problem no longer involves just unplugging and plugging back in the red wire. Now I have to unplug, then pull the battery out, put it back in again, then plug the wire back in. There's no obvious sense to this, other than it works.
Another previous post explains the box's contribution to your "vampire" energy use.