Loss of Sound - DirecTV

I have had DirecTV since 2013. I moved to my current location in December 2015. I recently switched from wireless genies to wired genies. I will periodically lose sound and to get it back I will change the channel to get the sound back. Also, at times when my wife is watching Korean TV, the sound will go out on the Korean channels. To fix this I have to disconnect the genie from the wall and unplug it's power cord to get the sound to work. I have never had this problem before.

My wired Genie model is C51-700.