Revently Poweramp updated on my phone, but for some reason after the last update my whole phones volume started fluctuating. like when you get a text, but with no noises. After some research I learned about audio ducking, I checked all of my OS, and the only thing that stopped it was turning off the audio focus settings in Poweramp.
I don't know why all of my sound in all apps would do this, but they did, and that fixed my issue.
Also when this happen on occasion it stops the music playing in Poweramp, and some times closes the app completely.