When I have to interrupt listening to an album or playlist — such as when I’m in the car and get to where I’m going, then return and intend to continue where I left off — Spotify instead starts playing a radio based on the album or playlist I was listening to. This is distinct from going to radio AFTER the respective album/playlist is complete, it’s when it is square in the middle.
This is a fairly recent phenomenon, maybe a couple of months. It used to always pick up from where it left off, or on the fairly rare occasion it lost its place it would start at the Home Screen and just not play anything. Hopefully there is a way to cancel this ‘feature’.