I had a 3 lever switch do something similar...the time frame varied from a few seconds to maybe not at all that time...i replaced the switch and took it apart to find the metal bar that is the inside of the unlock lever had come loose and would wiggle itself into touching other things in the box and cause a short.
once changed, poof...all was good...hope yours is just as easy!
Lord send your Holy Ghost into our hearts and make the desire of our hearts Your Will.
Pro-choice, that's a LIE, babies don't choose to die!!