I had a similar program, but playing from VLC rather than streaming.
It turned out that the program was crashing, but not closing. Using Task Manager to close it was not effective, a reboot was required. Ultimately in my case it was the early signs of a failing disk, it may very well be an entirely different cause with yours.
Next time it happens, trying starting the Task Manager and killing Spotify from there. See what happens - hopefully it will close, but if it doesn't then it requires investigation.
Also, when opening Task Manager look to see if CPU, Memory or Disk usage is unusually high.
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DVD playback issues 