Just happened to me 2 days a go, I kept having all my devices logged out and I couldn't get back in. a password reset later, it happened again the next day. I then found out that whoever stole my access connected it into their facebook and somehow managed to log all my devices out and took over with their facebook login. 

I think there's another security breach into Spotify (last ones were in dec 2017 and then early 2017) - I had an **bleep** connecting my spotify account into his facebook account, a Fernando Areco from Paraguay.

Anyhow, after I reset the password, this account is still attached to his FB with his name, found a way to disconnect his profile from spotify via desktop app BUT his picture and name is still showing as user everytime i use Spotify on any devices i have, absolutely ridiculous (shows how badly Spotify wants your FB account to populate the blank fields in their future advertising platform). 

I think Spotify is aware of this and probably they're going through a big clean up right now. Conveniently of course they're not letting any of us premium users know about this.