Playlist 'intrusions'

There is much good about apple music....but! I have procured a nice (limited vocals) jazz playlist that I like for when I'm working. But for the last couple months, while listening, a song is inserted that is not part of my playlist. Often it's a song that I've probably like somewhere else. So frustrating! It's become a constant after listening to maybe a half dozen songs of the playlist. Frankly, it's made me just shut off apple music and turn on something else.

Anyone have advice or thoughts on how to prevent this? Apple, please this is not a help to explore different music!