We have the opposite issue with our new GMC 2020 Sierra AT4 with android phone(s). When we connect via bluetooth, the phone volume is fine, but the MEDIA volume drops down to almost nothing and it WILL NOT LET US SLIDE IT BACK UP. When we do it immediately reverts to the low setting the truck changed it to. And, before you say it is a phone setting, this does not happen with the same phones in a 2019 Traverse Premier. Any help?