Unauthorised device using my account

[Saggs]

Whilst using spotify it has suddenly stopped what I was playing and started playing other songs that aren't on my playlists. It showed another device connected but I was unable to connect to them. They don't show as an offline device so I'm not sure how to remove them. Thanks in advance.

[Rodrigo]

Hello! Welcome to the community!

You can log out from your account everywhere here. After you do that, I suggest that you change your password, since someone may have used it to login elsewhere.

[OviiiOne]

Hi and welcome to the community!

First of all you must go here and click on "Sign Out Everywhere" (https://www.spotify.com/es/account/overview/).

Once you done it, I recommend you to change your password.

If once you done all, it happens something strange again, you should contact with Spotify Consumer Support filling this contact form: https://www.spotify.com/about-us/contact/contact-spotify-support/

If you receive an automated email that leads you back to the community or help pages, reply to it (even if it's from "no-reply") and one of the Spotify team members will get back to you as soon as possible.

Hope I helped you.
If I solved your problem, don't forget to click on "accept as solution"

Edit:
Ok, sorry Rod, my connection sometimes is a sh*t and it goes slow...