Vonpaco

I am new to this site and found it while researching the harsh down shift issue. I purchased a new 2018 1500 with the 5.3 and 6 speed in july of 2018. Have had it into the dealer 6 times for the harsh down shift on rapid deceleration. The problem began after it hit around 2k miles and was ignored until about 17k miles. They performed the normal relearn repairs and sent me on my way. They finally agreed there was an an issue when i didn't go away and found the 3-5 reverse housing was leaking. They repaired ( only 1k miles on repaired trans) the trans and corrected the problem. Unfortunately, they created another issue I am now dealing with. The truck now slams out of overdrive when I push the throttle to pass another car. The dealer is of course saying it needs to "learn" the shift points again and want me to drive it another 1k miles. I have my 7th service appointment on Wednesday. I attached my service invoice to show what they did.