In reply to Groundhog:
> Not sure what you mean by that. I have been advised to select a tune from a playlist and disable the shuffle symbol in the lower left corner, so that it has a line through it. But even if I do this for every track in the playlist it still plays tracks randomly from the entire library.
I don't know Samsung Music but from your description what might be happening is that turning shuffle off for a particular track means that it will never be selected if the app is randomly selecting tracks to play. This can be helpful for stopping a 'learn chinese' podcast from ruining your party!
But there could be a more general shuffle setting in the menus that tells it whether to shuffle at all, i.e. whether to choose the next track randomly (as opposed to moving onto the next one in your library or in your playlist). If you haven't found that option and turned it off, I expect it might be causing the frustrating behaviour you're seeing (or hearing!)