The airplay icon will not stay in my control bar!

The airplay icon will not stay in my control bar and when activated and turned to mirroring nothing shows up on my tv. I have airplay on, on my appleTV. So I am out of ideas and I cannot find anything on here to help. I am using my iPad air and it along with my appleTV are all up to date. I also just checked my iPhone 5 and it is not in the control bar as well. I have even restarted the iPad and it will show up just long enough for me to turn it on but nothing shows on the tv and when I go back to the control bar it is gone. I hope someone can help.