Spotify randomly stops playing between songs

[peachtree14]

On my Android phone, when I'm listening to Spotify online through a bluetooth speaker, randomly between songs it would stop playing. This happens with playlists as well as albums. As soon as I then unlock my phone it starts playing again, for maybe four or five songs, and then it will stop again. On occassion it has happened in the middle of a song as well. It doesn't happen to songs I have downloaded offline.