2018 GMC YUKON Vehicle Speed Control Problems

As of [XXX] , I witnessed a squealing sound coming from the rear end of my 2018 Denali Yukon XL truck. And it's affecting my braking. And it jerked when I changed my gears on my truck . And there are lights on in my dashboard on my truck. The engine light was blinking on and off and the traction control light was blinking on and off also. But the back driver side of the truck was squealing also. Please help me to resolve this situation. In the name of Jesus. Thanks again [XXX] and [XXX] . INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

No warning light presented to warn of transmission issues. While driving is hesitating sluggish when accelerating and stalling around 60mph then shifts . Putt Putt then pick up a bit then back down.

I WAS DRIVING MY 2018 YUKON DENALI ON A 3 LANE INTERSTATE WITH GM'S NEW ADAPTIVE CRUISE CONTROL TURNED ON.. ANOTHER DRIVER CUT IN FRONT OF ME FROM THE RIGHT. ADAPTIVE CRUISE SLAMMED ON THE BRAKES ALMOST CAUSING A REAR-END ACCIDENT BY OVERCOMPENSATING. THIS HAPPENED MORE THAN ONCE ON A 2000 MILE TRIP IN DIFFERENT TRAFFIC CONDITIONS. IN CONTACTING MY DEALER, THEY CALLED GM AND WERE TOLD IT COULD NOT BE FIXED BECAUSE OF EXTENSIVE SUPPOSED CHANGES TO THE VEHICLE. HOWEVER, OTHER GM VEHICLES HAVE A SHUTOFF THAT WOULD ELIMINATE ADAPTIVE CRUISE AND LET YOU NORMALLY OPERATE CRUISE CONTROL. I WAS THEN TOLD BY THE DEALER THAT I WOULD NEED TO CONTACT GM DIRECTLY. THE CASE NUMBER IS 8-4468390871. IN PURSUING THIS WITH SEVERAL GM REPRESENTATIVES, THEY CLAIM THERE IS NO FIX WITHOUT EXTENSIVE CHANGES IN SOFTWARE, WIRING, AND PROGRAMMING. BUT ALSO REVEALED THEY RECOGNIZED IT IS A PROBLEM AND...