I had a similar issue with AntennaPod on an older Android phone, not the Kompakt, but I remember playback would always stop randomly when the screen locked. It turned out that battery optimization was silently turning off background activity for the app. Once I exempted it from those settings, it worked normally again. So even though the behavior felt like a bug, it was more of a power management setting issue.
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Also, back when I was cleaning up my music library for different apps like AntennaPod or Plex, I had to convert a bunch of WMA files to another format that would play better on Android. I used this WMA converter for that, https://www.movavi.com/audio-converter/wma-converter.html, it saved a lot of hassle and kept the audio quality solid.
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