I re-booted the box a couple of times yesterday, no fix. It has to be either the HDMI cable, or the box. My AppleTv has no sound issue and it is hooked up by HDMI also. I have another DVR upstairs and no audio issue. So I need to try to switch cables, the box is set up to go HDMI out to the TV. SO if the AppleTV HDMI cable doesn't fix the issue it must be the box.
I get no video interruption.