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In this case it's a good idea to go ahead and secure your account using the instructions in this Support Page. Don't forget to change the password for any service associated with your account, such as your email address, Facebook, or Apple.
We recommend that you also have a look at all third party apps that have access to your Spotify account and remove any you don't recognize. You can learn how to do this here. For the other ones you should update the login info as well.
If the issue persists, could you let us know if there is a specific song or songs that always play or random one? If it's the former we'd appreciate it if you share a link to them. We'll make sure to check them out from our end.
Hope this helps. Keep us posted how things work out.
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“Music is a language that doesn’t speak in particular words. It speaks in emotions, and if it’s in the bones, it’s in the bones.” - Keith Richards