I've "Signed out of everywhere" several times since this problem started months ago. My password has been changed since then as well.
I have three devices I listen to Spotify on, my phone, my laptop, and my desk computer. None of those devices have the name "LAPTOP-C4ETKNVC"
Whoever is using my account, starts to listen to the same songs. Today they've played these songs: Home - Resonance || Melanie Martinez - Mad Hatter || Pink Guy - Stfu || Melanie Martinez - Sippy Cup None of these I've ever heard of or willingly played. They haven't even shown up on my 'Discovery Weekly'.
When this other person has control over my Spotify, I will change the song to something in my playlists but it will flip back to the other device before my song is over.
If I move the time to later in the song so it will end, something puts it back towards the beginning. This tells me there is some thing/one on the other end of the device that is not mine.