I recall a documentary where they tested the set-up using the same electronics and solenoids and that was pretty much determined to be the cause. It was an early radio-controlled "rudder only" remote and it was demonstrated that the arming circuit, detonator and the flight control circuits "cross-fed" from the power surge of when the safety interlock was pulled out of sequence with the start-up of the flight controls. They were supposed to do that last just before bailing out after the flight controls were on.
As we detectorists now know an electronic spark is like a broadcast on all frequencies.
Other mysteries that would be interesting to solve: the five Avengers that vanished off Florida. And of course Amelia Earhart.
And one that I have always wanted to hear solved - L'Oiseau Blanc (White Bird) and pilot Charles Nungesser (WWI Ace - 43 kills) would have been the first non-stop Paris to New York City trans-Atlantic flight two weeks ahead of Lindbergh. But he was never seen on this side of the Atlantic. Though there are reports an engine was heard at what would have been the right time and along the Great-Circle Route just inshore in the state of Maine.
But an interesting one that did not disappear in the sea is a F-89 Scorpion interceptor (1953) that vanished over Michigan - likely into Lake Superior. You'd think in 65 years someone would have come across something.
