While playing Apple Music, when a song changes to the next in the playlist, the new song does not have audio. You can see the seek bar moving, counting down to the end, but there's no audio. If you restart that same song, audio plays.
The missing starts at the beginning of a song and never starts up. When that song ends, Apple stops responding, in the sense that it does not move to the next selected song.
If you restart that same song, it will play fine.
There seems to be no rhyme or reason for which songs do it.
Although I have seen some older reports of this happening, for me it started with the Golden Gate upgrade.