How on earth can you #STOP @youtubemusic from playing songs that are #NOT in a #playlist I told it to play, and that I don’t even want to hear at all? What use is a playlist if a program repeatedly keeps putting in music against your will???
That doesn't seem right – try clearing the app's cache and updating it to the latest version. Also, uninstalling and re-installing the app usually does the trick. If this doesn't work, we'd recommend you send us feedback via our Send feedback tool: http://yt.be/help/feedback