Radio/tape Cd Player problems of the 2019 GMC Terrain

Two incident warnings on my dashboard saying of my back hatch was open when it was not. Had it serviced because the dash warning would not shut off. Service said it was fixed then happened again. Twice this happened intermittently. Another incident when on navigation screen, when the navigator gave directions it changed to phone screen and went back to navigation screen when she stopped talking, like she was calling me to verbally give me directions! the most worrisome was as I was going 50 mph on city street, my gas peddle stopped engaging with the engine and I was loosing speed, as I pressed on the gas peddle harder the car was decreasing in speed as I watched the speedometer. During that incident all was working including brakes, radio and steering. I proceeded to drift into a driveway to stop the car for help, good thing I was not on the freeway could have gotten killed. The car is getting serviced now, I do not want it back, will trade in for different make/model is this considered a lemon and which laws/action do I take? I've only had the car only 7 months when this started to happen.