LG VX-8600 / AX-8600

I just recently got a MicroSD card for my new VX8600, and transferred my music onto it. I started playing the music, and closed to phone. After it's closed, the music would randomly pause/skip to the next/last track. The thing is, my fingers aren't even touching, nor are they even close to the playback buttons, or even the side buttons. It continues to pause/skip even when I'm not touching the phone at all.

Has anyone had this problem when playing music with the phone closed? Is there a problem with my phone? I've only had this phone for a week, so I'm still able to get it replaced.

Thank you very much in advance.