Why does my Google Play music all access app skip to a new song every 20 seconds or so?

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AC Question

google play music all access app issues

I have google play music all access and it skips to a new song every 20 seconds or so. How do I stop it doing this? I've tried uninstalling and then reinstalling the app. Its not an internet connection issue because its doing it with music that has been downloaded to my device as well. Also, the issues doesn't occur when I access google play music via my sonos app.