djay 2 [iPad] Autmix/Spotify issues - songs not loading maybe?

I’m using an iPad. Trying out Automix.
When I load a Spotify playlist, it plays only about 10-30 seconds of the song and then stops playing because the rest of the waveform is blank. The time runs down and it starts the next track, which then does the same thing. I have the entire playlist downloaded to my iPad, so I don’t have to rely on a wifi network. Anyone know why this is happening?