Car Accelerates On Its Own Problems of Chevrolet Colorado

I bought a 2015 chevy Colorado at the beginning of the year - since then I would on occasion notice a "shudder" or sluggish acceleration followed by sudden burst of rpms/acceleration. At about the 3 month mark (around 4500 miles) my transmission failed and was replaced. About a 3/4 of a month later I got my truck back and continued to notice the same shudder and erratic behavior. I began to research the issue and found many drivers of this and the GMC model are encountering the same issue. I have had to nag the dealership about the issue and there eventually was a tcm (transmission control module) software update which seem to max the issue which is beginning to manifest itself again. The short version of symptoms is as follows: sudden acceleration at slow speeds (this caused me to almost hit a motorcyclist in slow moving traffic), odd gear shifting (or lack of) going up hills, or going down hills, sometimes turning. . . Odd shifting at normal speeds (but normally on hills). Vibration at normal driving speeds that seems to come from under the truck (not the tires)? I'm finding the truck to be more and more unpredictable and am not sure I wont encounter another failure in the near future.

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The contact owns a 2008 Chevrolet Colorado. The contact stated while shifting into drive from a full stop, the vehicle abnormally accelerated. The contact was unable to stop the unintended acceleration and crashed into a garage, damaging the front end of the vehicle. The contact sustained minor injuries to his arm. The contact was able to engage the emergency brake to stop any further abnormal acceleration. The contact stated he did not come into contact with the accelerator pedal at any time during the failure. The manufacturer was not contacted. The failure and current mileage was 36,000.

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