Hi!
I'm having a very similar issue on my Sony Xperia 10 mk III.
The difference is that my Poweramp doesnt fully stop but pauses for a split second and then resumes playback on minimizing/maximizing or screen turning off/on.
I have done everything I can in regards to power management and it didn't help the issue.
Now an interesting thing is that I have two sets of bluetooth headsets, and on one runs without an issue. The problem just appears on the other one. The thing is, the headset that has no issues is an older model only capable of AptX support. The one with issues supports AptX Adaptive. So I tried developer options on my phone and forced the headset with issues to use Aptx instead of Aptx Adaptive, and the issue vanished...
So perhaps it has something to do with 24bit transmission? (old AptX uses 16bit)
Best!
Crow
