I run my apple tv on a mobile hotspot network with limited data. How can I keep the apple tv from automatically updating.

I travel fulltime and use a mobile hotspot for my internet access. I use my apple TV mainly to be able to stream movies to my TV. Since the 6.0 update I can no longer controll when I update the Apple TV. This is more than an inconvenience since the auto update has caused data usage overrun and higher phone bills. At $10/gbite this not a cost efective for a minor update. Is there a way to turn off the auto update feature of the Aple TV?