I have a Samsung Galaxy S7 on 6.0.1.
When I'm listening to music and it's in the background and I pause it or gets paused by another app like youtube. The app instantly closes, is removed from the notification dropdown, and I have to go relaunch the app. Most music apps allow you yo go back in the notification drop down and press play. It's very annoying and is the only reason I have yet to purchase.
I tried removing Poweramp from the battery optimization and also enabling the wakelock setting. This is the only issues preventing me from buying.