Spotify keeps closing!

[ginger--]

Hi, so, I've had spotify for about a year now, and it's worked flawlessly until recently. I've moved from my iPod to an LG phone, a cheap one I've gotten at Wal-Mart, but it works nonetheless. 

Spotify continued to work perfectly on said phone, until recently. Like, a week recently. I'll click one of my playlists, and it'll either play a few songs and just cut off, close out and just stop playing, or it'll start a song and get half-way through and then stop. 

When that happens, I have to log back into my phone and get back into the app and press play again. I have no idea why this is happening, and it's beginning to get annoying! I've even tried to unintstall, then reinstall the app. I've paid for premium for about four months, and this is the first time it's done anything like this.