You probably leaked tranny fluid at the Oring connector. If the leak is slow enough then it will never drip to the pavement. if its super-slow, then it will never even go to the tranny pan. It will instead go up the wires, and only up the wires, never to be seen below the car. Evil eh?

Once it gets up the wires it reaches the tranny computer that sits under the passenger's feet. If it gets it too wet, your computer starts to die.

Its good that you're taking the car in. Those leaks are very deceptive.

Considering pulling back passenger's carpet, pulling back the extra layer of padding, and pulling back the styrofoam under there. You'll then see a metal plate. Mounted on this metal plate, but behind it so you can't see it yet, is the tranny computer, and I believe the stero amplifier, as well as the ABS unit. There are 3 nuts to remove to allow the removal of the metal plate, but even without doing that the metal plate has some holes you can stick your finger in. Stick the finger in and feel around: feel anything wet? I hope not.

EDIT: But this problem sounds much more physical than electronics related. The leak could certainly cause a loss of fluid which can cause a physical problem, but these trannies usually die slow with a fluid loss, not suddenly. But hey, its worth checking out.