No idea for those channels. But double check your audio settingsin the hidden HDMI menu (assuming you have Motorola) Possibly a Dolby Digital signal being sent that your TV cannot handle.
Hidden menu. From on press power off on box then QUICKLY press select then menu. You may have to try a couple times as timing is everything. Once there go to additional HDMI settings. You want to try setting audio setting to L-PCM.