Have this problem every time I sync a long playlist. An error message occurs:
"Spotify has paused syncing your offline playlists since it's currently idle. Open Spotify to resume syncing."
Now I can't really sit and wait and be inside the app if I sync a playlist of X hundred songs, so how can I prevent this from happening?
Solved! Go to Solution.
To sync, the Spotify app needs to stay open, otherwise after 5-10 minutes it will stop syncing in the background. This is due to Apple's background activity restrictions.
The best way is to go into the iPhone settings:
Settings --> General --> Auto Lock --> Set it to "NEVER"
Now leave the Spotify app open on your iPhone and let it sit on a table plugged in to charge
For me 1,300 songs (extreme quality settings) takes about 4-5 hours to sync with leaving the phone open to the app.
You might have to just leave your phone open to the app so it can sync overnight.
When you are done, make sure to turn "Auto Lock" back to your preferred setting.