We have and have had had 2019, 2020 and 2021 Ram 1500s (LoneStar/Big Horn and Laramie trims) in the extended family and the 2019 LoneStar/Big Horn mirrors were the worst performing for all of us. Our deal replaced the 2019 mirrors in 2020 and they were never a problem after that. Our 2020 and 2021 Rams have had zero issues with the mirrors. My personal truck (2021 Ram Big Horn) has never had an issue with the power mirrors nor the AC.Maybe they’ve been improved? My truck is an early build 2019MY (May, 2018 build). I have no confidence in mine. They seem to be very cheaply made.
I'd recommend anyone with a 2019 Ram with mirror issues take it in to the dealer and have them replaced under warranty as it made a difference for us.