Anyone experience car stalling while driving?! Was driving 80mph and it stopped

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I drove to Florida from NJ last week. About an hour from my destination, I pull into a rest stop, at about 30 mph, the steering wheel locked and I realized the car was turned off! Came to a stop, couldn't start car, wouldn't turn over. I couldn't shift into neutral. Sat for 1/2 hour. Roadside assistance came by, jumped the car. It started right up. Turned it off, then on, all seemed fine. Drove around Florida all weekend. Started trip home on Tuesday. About 300 miles in, traveling 80 mph on I 95, car shuts off!! I'm in the right lane, steering is not possible, veer over to the right into rest stop-thank God-able to coast into a space. No warning lights at all came on. Once stopped I push the start button, the car starts. I call Dodge. We arrange a tow. I started the car, decided to drive to nearest dealer. Made it 3 miles, car turns off while going 65. Pull over, have it flat bedded to dealer. It's still at dealer-I rented a car and drove home. They have no idea what's wrong. This is just crazy!