my suv shakes when I accelerate more than 35 miles or more

 

I'm having vibration issues with my brand new Mazda 6 when it hits 80kmph. I was told today there is a known issue with the Cylinder Deactivation System, which kicks in around 80kmph. My car is currently with the dealership while they fit a "part" to hopefully resolve the issue. They haven't yet told me what the part is to fix the problem. I will be test driving it again tomorrow and if the issue persist I'll be taking it straight back.