Help! I've started using my ATV3 for the first time. Whatever I'm watching, be it a movie from say Showtime Anytime or Crackle, or a tv show from FX NOW, the system stops and the screen goes blank. It happens continuously. Help!

My ATV3 continually stops streaming several times during whatever I'm watching. I have to re-start the system and start from the App screen to start streaming again to finish watching a show or a movie. What is causing this and how can I correct it. Also I've noticed that a random song from my iTunes library will occasionlally start to play on my MacBook while I'm trying to restart my ATV3 even if iTunes isn't running on my laptop..