I have a problem when syncing music to my phone, excluding applications and after some time I turn again in offline mode I must again sync music. My phone is Nokia Lumia 720 with Windows Phone 8.1 PfD. I have sowhen the applicationis installedon the memory card.
I'm having the same issue, it downloads the music for offline mode, then after some time (1-2 minutes) it starts to download again (if I turn off WI-FI and mobile data it's unusable), if I let it download it does it repeatedly. In the offline&sync menu it states that i have 4100ish MB downloaded, but can't play anything offline.