[Solitude042]

One of the media players I used (on Android) had a bug in which it was susceptible to getting put to sleep when in the background - it would promptly be reawakened by the player service, but that would cause a glitch each time (especially at the transition between tracks). Once I removed the player from the power optimization list, the glitches evaporated entirely. Maybe something to look into, since it's a different cause than the three on your list?

[c0deR3D]

Sure, I'd try remove the app from the power efficiency restricted app list, which by default are enforced on all apps.