Offline Listening not working - All three of my ios devices

[jwi3-us]

Hello.  I have 3-ios devices that I use with Spotify.  I've been a premium member for almost 3-months.  Up until today, the listen "offline" feature has worked well.  Today, I was listening to the 1st song on an album, when done, it didn't continue to the next song...Instead, my iPod began playing a song from my iTunes library.  I went back into Spotify and that's when I noticed that the slider switch on that album, and all of the albums that I have synced were turned off. The green notifier was still on those "synced" songs, but the slider doesn't stay on after I leave the album and go back in, or if the iPod screen turns off. I pretty much only sync music on my iPod through a WiFi connection, and then listen to synced music in my car. There is 10.3 GB of available space on the iPod touch.

This is also happening on my iPhone 6, which has 94.9 GB of available space and iPad Air, which has 6.7 GB of available space.

I've uninstalled and reinstalled the Spotify app on each device, and the offline feature is still not working on any of them.  I've logged into the Spotify site and checked my account...I'm still current, and will be coming up for a renewal on 5-days.