FOX NEWS - Intermittent Audio - Sound goes in and out frequently

For the last three weeks and only on FOX NEWS, the sound disappears for a second or two and comes back.  This happens off and on throughout the day every few seconds to once every five minutes or more.  It's disgusting and only happens when we watch Fox News, no other channels have this problem.  I've been told by Cox there is no such problem from their end of transmissions and I've had technicians out and they say there's no problems.  Rebooting of convertor does not help.  Who else is this happening to?  I'm in Cox San Diego North.