Spotify pauses randomly, starts playing randomly and cancel sound randomly

[Bearcraft]

Hi all,

My Spotify suddenly act very strange. When I start Spotify I can usually play a whole song, but then it starts. At first the sound is cancelled, and device is changed to Web player (firefox) which I have never used before (and didn't know existed). Spotify then also changes to songs made by "Lyons", a band I also never heard or listened to before. All shuffle options are enabled, even if I had disabled them before.

If I change the player, turn on the sound and disable the shuffle, and then start playing a song on my playlist, spotify starts to change song to just the next one in the list, every 5 seconds or so. Any solutions to this?