Picked up a relatively cheap Nexus 7 at the weekend and I'm having a minor issue when listening to music through it.

I'm subscribed to the Google Play Music service and when I'm listening to music and the screen goes off, when I come to unlock it again with the music still playing there is a loud buzz noise that lasts for a split second. It doesn't do this on my Nexus 4 and just wondered if anyone else has encountered the same issue?