My car has started to actually cut off, sometimes.

What is your question?

My car cuts off when I'm driving, no system light comes on, the car just stops. So far, it starts back eventually, but I would really like to have some idea of what's going on. It's not the battery, the lights still work. When I turn the key, it makes no sound at all--no click, nothing. It eventually will crank, right now--but it's unpredictable in how long it stays off. I'm scared to drive it right now, please help if you can.