Engine Funny Noise problems of the 2006 Chrysler Town & Country

During the first incident, I lost all power to my engine, most of my gauges, and my power steering while driving 35 mph. I pulled my car over to the side of the road and it wouldn't restart immediately. The dealership had my car for aprox. 5 days and couldn't find anything wrong. About a month later, the car stalled the same as before, except this time it was right after I started the engine and began pulling up the driveway. Aprox. 8 minutes later, it stalled again, with the same problems as in the first incident a month previously; however, this time I was driving 50 mph on wet country roads. I suddenly lost my heating/forced air, my engine, and most of my gauges. I didn't loose my power steering immediately. While I was still moving at 50 mph, I put the car from drive into neutral, restarted the engine, and put the car back into drive. A few seconds later, it stalled again, but I noticeably lost the power steering immediately that time. I was able to safely pull the car over, turn the ignition to off, then restart the car. I drove from there to the dealership without further problems. The dealership has had my vehicle for 10 days so far, and cannot locate or diagnose a problem. In every incident, there was no warning whatsoever. The car didn't make any unusual noises or behave erratically. One moment I had power, and the next I didn't. I simply lost the ability to accelerate my vehicle, lost my power steering, my engine stopped running, and the gauges all dropped to zero. No warning lights of any kind ever came on, and I didn't loose the electricity to my dash, radio, etc. Though I lost the blowing warm air/defroster function that had been turned on.