Randomly changing from playlist to radio

[Vpalex]

I use spotify premium on my LG G4. I usually play music on my way to work and back. I open my playlist and start a song. Two or three songs into the playlist, spotify randomly changes the song on radio mode based on what I like rather than continuing down my playlist. Super irritating that every 2 to 3 songs I ave to stop the radio and start my playlist again. Any idea why this might happen. Remember I am on the road and not connected to any other devices at home.