Owners/service Manual problems of the 2013 Ford C-max

Two months ago the sync would not respond. I was unable to make or receive calls, change the volume nor turn off the radio. I took it to the dealership. They said there is something wrong with the vehicle. Two days later I drove my vehicle to work, parked it and went inside. After my shift my vehicle would not respond to the fob. I removed the manual key and attempted to start the vehicle. The engine would not turn over. I took it to the dealership. They did a 120 point inspection. They said nothing was wrong with the vehicle and did a master reset. I contacted Ford customer service and they told me to resolve it with my dealership. I informed Ford that I had read about this problem online and there are hundreds of complaints about this same issue with owners of Ford cmax and Ford focus. The vehicles simply die and the dealerships cannot diagnose the problem. Ford customer service told me they were not aware of this problem and again referred me to my dealership. Three weeks later the same thing happened again. My vehicle was parked in front of my apartment. I had just returned from the store and needed to run more errands two hours later. The volume on my radio was not responsive. I could not change the volume nor turn the radio off. I immediately went to the dealership. Again, they could not diagnose the problem and simply did a master reset. The issue was never resolved and I'm afraid this could happen every month.