I have the desktop app and the Amazon Fire app and up until a month ago they both synced perfectly. I never needed to sign in/out, none of that. Unfortunately now they are not syncing. I have tried the signing in and out but they don't. I have not changed any settings. But I could not find any specific settings relating to sync on either website settings or app settings. As I wasn't aware of this, I now have ended up with the same playlist with different tracks (i kept adding tracks to both not knowing they weren't syncing) on both devices. The first 20-30 songs are synced and the rest 30-40 are all different on both desktop and app. Please help!