the volume keeps getting softer and louder. - DirecTV

The volume gets softer and louder on most channels. This is a wireless box. I swapped with another wireless box in the house with no help, I tried differrent HDMI cables but no luck. Cable goes directly from the box to my smart TV, no sound system. rebooted boxes and router no luck. Has the same problem with DVR shows. Sound from TV is fine when watching Netflix and bluray. Please help.

This question, "the volume keeps getting softer and louder.," is about DirecTV channels, programming, equipment, and sports.