[brainstorminterlude]

Hi,

So basically every so often on my phone (Nexus 6) I'll be listening to music through the headphones and when I go to adjust the volume it doesn't show the normal 'speaker' icon, it shows a square icon that looks a bit like a screen with some diagonal lines through it. I can't find a picture as I don't actually know what it means/represents on the phone, which is what I'm trying to find out.

For example earlier today I was listening to Spotify on my phone and went to adjust the volume but it just kept reverting back to full volume on my phone with this screen volume icon thing. I used a task killer to stop everything running on the phone and opened Spotify again and it had reverted back to the normal speaker volume icon and I could adjust as normal.

Any idea what this is?

Thanks