Is all of them, every "smart tv" does it, even after adb, permission restricting or rooting. Insert a (non infected) usb lamp in your tv and see the lamp turning on when your tv is off. It notifies you about the background activation activity :) Interesting to see when exactly get active (is it keywords or nearby devices or scheduled processes)? Can´t be keywords as that would mean 24/7 active and the lamp says otherwise.