System goes to screen saver - DirecTV

#1
When we are gone we usually leave the tv on for our animals for comfort for them. The last two times we have done this, our tv was in screen saver mode(it was saying directv) and I had to turn it off in order to get the system to work again. Why doesn't the tv just continue to play? I also had to reset the receiver as the system was frozen.
 
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