Our roadster was running just fine (both parked and while driving) for over an hour, but just stopped all of a sudden while on the road. I checked for spark, but had none. I had recently changed the condenser (that morning), so that doesn't seem to be the problem.
I will try screwing out the cable tomorrow, but doesn't sound like that's the problem (as it ran fine for an hour before stopping).
I did notice that the coil was too hot to touch.