I've been a spotify premium customer for ~2 years, but this problem has only recently begun. I'm quite a bit irritated since it's a recent occurence. I'm extremely busy and it's more than a little annoying to have to waste time attempting to figure out what the heck is happening here. 

I'm currently running the most up-to-date version of spotify mobile on my LG/Google Nexus 4. I've made sure to allow spotify through all of my computer's firewalls in order to sync with my phone, and although my phone does synce my playlists for offline access, songs I've included in playlists that are from my personal collection will no longer play in spotify mobile. It's been like this for three weeks or so, but I'm just finding the time to write about it. It's important to note that:

- the songs used to play (there's nothing wrong with the format) and I have no idea why they've stopped.

- I've tried reseting the app (deleted all cache and data) and re-synced and the songs work all of an hour or so. 

- I have not changed the location of any of the files on my computer and they all work fine in the desktop program and web player. 

- I have made no recent updates to my phone's OS. 

- Yes, my computer and my phone are on the same network and my phone shows up fine for syncing in the desktop program.

- Sometimes if I select the songs that aren't working the song will act as if it's going to start playing (the artwork shows up and the play symbol turns into a pause symbol) but the meter for the song does not move at all. 

Any and all help would be greatly appreciated.