Why does a blue message pop up notifying me whenever I change the volume?

[AC Question]

So, I have an LG G3 and whenever I turn my volume up or down, a little blue box pops up at the bottom of my screen saying Volume Changed and then it specifies what volume (ring, notifcation, etc) it was. Anybody know how to get rid of this? It started randomly a few days ago. Any information on these little blue boxes would be appreciated, I sometimes see them exiting apps and I don't know how to get rid of them! Thanks in advance