I've have the same problem(s). The play/pause bar is 'frozen', and Spotify stops playing when my screen locks. I've changed all the settings to allow Spotify to keep playing when phone is locked (guides found in other forums) but it's still doing it. Very frustrating when I'm trying to listen to music while going for a run. Also, there have been a few occasions where it just starts playing again in my bag after I have left my car.
Yes. Just upgraded and setting the same thing on the phone. I can select a song or playlist, but the play / pause bar doesn't update and still shows a previous track. Happens to me particularly when playing on a connected speaker. I can't stop the song on my phone,but need to turn off the speaker. Frustrating. Is there a known issue?