Songs start playing after watching a video

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Plan

Free

Country

 Australia

Device

(Samsung Galaxy 8

Operating System

(Android 

My Question or Issue

 I pause a song as I am done listening and exit out of the app.

Hours later I might have a video ad pop up in a game I am playing. My media sound is off.

Then all of a sudden spotify starts playing the song it was on before with medua sound on. 

How do I stop this?

Thanks!