iPhone 6+ / iOS 8 Offline Mode No Longer Working

[Ptyers]

I've had Spotify Premium for a number of years on various phones and OSs and up until about 2 months ago it worked wonderfully on my iPhone 6+. However when I choose "Save" on an album or playlsit it only donwloads a sporadic number of songs (at best, 3 songs out of an album). I'd really love to get this problem sorted as it's a great feature that I use very regularlary.

A couple of points:

- I have plenty of storage (>30Gb remaining)

- Have updated to newest version of Spotify and iOS

I am loathe to reinstall the app as I do not want to lose the albums that I've saved already.

Many many thanks for any pointers or help. Much appreciated!

Paul