Air Conditioner problems of the 2011 Jeep Patriot

Vehicle stalled while driving & engine turned completely off. The vehicle was placed in park, the ignition had to be restarted & put back into drive. After that happened, the air conditioning was on & projecting a smokey smell into the car. Another incident that happened multiple times was the car was shaking & brakes were hard to push on while steering was hard as I was turning onto a street from the freeway exit. While in motion, the car will ding as it is turning or going straight or pulling to a stop. As the car was turning right, the steering locked & I couldn't accelerate. I rolled to a stop at the side of the rode & the brakes were hard to push on. These issues have occurred on multiple occasions. The Jeep dealership can't find the issue with the car. This car has approximately 50,000 miles. That's about 10,000 miles per year.