Welcome to the community
I'm sorry to hear that the sound isn't working on all of the channels for oyu right now. I'd like to help check this out for you.
How are things looking today? If you're still experiencing loss of sound, let me know if you have rebooted the box to give it all a refresh and I can help further.
Keep me posted, I'm here to help if you need me.
Tech fan? Have you read our Digital life blog yet? Check it out