Hey @biddyhopkins
Can you give more details on what exactly happens? The Spotify app should not be randomly unmarking music for offline use.
Are you trying to save offline music on more than 3 devices? You can save music for offline use on up to 3 devices. If you have more than 3 devices, the offline cache will be deleted on one of your other devices to stay in the limit.
Check out the offline help article: https://support.spotify.com/using_spotify/search_play/listen-offline/
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