Recently mysteriously had all my playlists deleted and lots of tracks I never played had been played and weird playlists added in place of mine. Went and reset

Recently mysteriously had all my playlists deleted and lots of tracks I never played had been played and weird playlists added in place of mine. Went and reset all 3rd party access and reinstated my playlists and it hasn't happened again since. I chalked it up to maybe logging in on someone elses mobile device while travelling to play my playlist and then forgetting and then they did it, but maybe it was bad actors over the internet. I'll never know.