MJJB

I bought a 2020 Trail boss a few months ago with 9 miles on it when I drove it off the lot. Around 300-400 miles I started to get hard down shifting while breaking and just cruising to a stop sign/light happens around 5 mph or so. I now have 5,000 miles and it still happen frequently. Just got it back from the dealer. They said they couldn’t get it to hard downshift. My guess is they didn’t drive it much. They couldn’t find anything wrong. They told me GM says that’s normal. I say BS. I’m going to bring it back again if it continues. My brother has a 2020 trail boss as well with no issues.