Why is this icon appearing when I'm trying to adjust volume

[rlee22]

Hi guys. Not sure why but I have a little TV appearing where my volume icon should be, and while it's there it doesn't let me adjust my media volume, any ideas of how I can make it go away? It's usually only there when I have media output connected, but now its not going even when I've disconnected from everything 

[Beep1]

 I was Spotify on my laptop. I went into Spotify and changed device to phone and it disappeared.

[Beep1]

When I'm running Spotify on my laptop i get the volume icon on my phone. I went into Spotify and changed device to phone and it disappeared.

[Technical]

I finally found the solution. Very easy. Click on the volume up button, click on the 3 dots, you will see the lines for the different types of sounds (ring, media, settings, notification). You will find an extra line with TV icon. Click on it, it will tell you what app uses it. Just uninstall this app and everything will be back to normal.