re: #36 calochortus
Gah. My garage door has just started opening and closing itself. Presumably this is related to the fact I lubricated the track this morning. Must go stare at it.
Laterz.
Look for a little lube or something that might have gotten onto a sensor switch. It may be making a circuit closed and the door is responding to a signal/command. You will want to unplug the power before touching anything electrical related.