Automatic Transmission Torque Converter problems of the 2012 Buick Enclave

I have looked up my vehicle information through gm. I can see where they had the vehicle in a shop in NY to look at it. Unknowingly I bought a vehicle with a huge list of issues! first of all, the torque converter was going out on my vehicle when I purchased it for a dealer. Second, the transmissions on the Enclaves, acadias, traverses and terrains are junk! I take great care of my vehicles and have never had a transmission fail on me at 100,000 miles! when gm has this vehicle in NY they should had replaced the transmission and the torque converter when it was still under warranty! they stated that they could not find out what the issue was. Every single person that I have been in contact with that has the above named vehicles are left with transmission failure at very low mileage. Now I'm left with having to repair the cost of both units. This should be investigated as to many issues are arising from these models. When you are driving down the road and the vehicle does nothing but shudder and shake while not wanting to accelerate is dangerous! my transmission failed out of no where! I currently do not have 4th,5th or 6th gear.