Hmm. Having this issue with my 2021. I'll try last post info. But didn't have this issue with the 2015 high Country. Well see how it turns out..
Hit home button, go to sound, set to what I want max start up volume to be at then shut the <- arrow at the top left and NOT the X in the top right. Then hit the sound (or speaker on screen button) then shut truck off, open Dorr so every thing shuts off. Wait a minute or so then should be good?
I'll try but feel like I've done this and hopefully don't have to keep messing around.