Kind of cross posting with my comments on this issue. I think that GM might be in some trouble coming really soon with these tranny issues that they have known about in the 2015 and 2016 Colorado/Canyons, and now the 2017 experiencing other trans oddities. I've had this law firm out of Cali that kept trying to contact me about these issues, I kept ignoring them and by mistake I answered their call the other day. The lady told me on the phone that they have a substantial amount of people that have complained about these issues. I love my Colorado as much as everyone does on here, but there is no excuse that these trans issues persist. With the downshifting and the trans not being able to shift quick enough into the next gear causing the chuggle/hesitation, if you try to pass someone up and they are being a jag speeding up I can see potential accidents. Or as you are trying to speed up after making a sharp right or left turn, the trans does its hesitation BS while someone is speeding up behind you and boom you get rear ended because you couldn't accelerate into the next gear fast enough.
I have over 9,000 miles on mine now which I've had since September 2016, so I think the entire system should have learned my driving habits by now.
If a BNR tune and the pedal commander are helping somewhat solve this issue, GM has to get this figured out.