Music and sound effects on avatars sometimes loses its spatialization settings and sounds crackly and avatars of users that should have no audio from safety settings, you can hear the audio "pop" when they shoot their guns or swing their swords. What I use that gets affected by this issue: https://kiny.booth.pm/items/4881102

Another thing to note, the world doesn't seem to matter, as this happens on and off in the same world, during different days.