2013 Ford Mustang drivetrain & axles problems

My mother bought this car brand new, the neighbors hacked into the sync system once and had issues out of radio since, but she's not concerned over that, the 6speed transmission will shift on its on, be running 55 and downshift to first, and go to pull out in 6th and had almost got her hit more than once , I hooked computer to it reset everything to factory except the my key and bluetooth which neighbors hacked, but I took down the rd and driving normal to set shifting points, I was in a 60 MPH zone going 55 and…

Vehicle will suddenly not accelerate while driving - randomly. The car had no response. At times, wrench light will be on - other lights too. After turning off car, the problem seems to go away, but it has repeated and frequency seems to be higher. This is very dangerous as this happens in highways or exists, the car is basically with no response.