[qasdfdsaq]

Well I figured out what it was for me. There's two different things.

One is the mute/pause music when you place your palm against the phone (feature), the other is the RAM management being bad - for me I only notice it when browsing heavy web pages during which the music player sometimes exits.

But the placing palm against phone to mute it feature did trigger it a few times in my pocket too. I just turned it off. Not happened once since.