I have a 2020 TH and I have the same problems with the transmission shifting and being sluggish. I noticed when I am at a complete stop and start to go the vehicle hesitates. Also, the vehicle does not shift at the right time both upshifting and downshifting. I have heard about the GoPedal but when you buy a brand new vehicle you expect it to work correctly without having to add extras and spend more money on top of your monthly payment. The dealer checked the transmission and told me it's fine but logged it in my service record. At my next oil change which by the way, the dealer recommends at every 5,000 miles and not 10,000 miles as stated in the manual, I will have them check the transmission again.