I have Plexamp on my Pixel 3A. My screen is set to turn off after 5 minutes of inactivity. I also have Plexamp set so battery optimization for the app is turned off.
If I am listening to Plexamp and the screen shuts off, after a few minutes songs get stuck and “skip” (play a second or two of sound on a loop).
The loop will continue until I unlock the phone and wake the screen and then it played fine until the screen shuts off again.
This occurs with offline music even when connected to wifi.
That’s a very strange issue I haven’t heard of before.