This is a new bug, presumably from Poweramp because I haven't had any OS updates recently. In short, when you pause Poweramp using a bluetooth controller (such as on bluetooth headphones or on a car dashboard), when it is unpaused, the volume drops, necessitating you turning the phone volume up again after every pause.
Poweramp build number: build-893-arm64-play [893004-dd1054bc] Full version 64bit Your device model: Xiaomi MiA1 Your Android version: 9 Your custom ROM name/version (if you're on custom ROM): n/a Steps to reproduce: Pause Poweramp with a bluetooth controller (eg. on headphones or car dashboard).