I had to change the saber around just a little. Two nights in a row the saber just went off by itself twice (two times per night). When I say went off I mean it acted as if the kill key were removed (said ultrasound 2.5). Scared the crap out of me and my wife the first time it did it and then it just became annoying.
Figured it was a ghost that liked sabers.
Anyway it was a flaw in the recharge port (first time I have had that problem with the little ports). I decided I had plenty of room to put in a 2.1mm port in it so I drilled the hole out, tapped it, screwed the recharge port in flush and wired it up. It has not gone off since thank goodness.