I only use the button board when I have a problem with the remote. I have tried new batteries in the remote. I have tried taking the batteries out of the remote, and just use the button board.
We can go several days with no problems. Then while watching TV, and not using the remote or the button board, the sound level meter comes up on the screen, and the sound level starts to change. Sometimes it only changes a couple of numbers, then goes off for a long time. At other times it goes all the way to 0. Sometimes as it's going down we can override it with the remote, and sometimes we can't. A few days ago the TV was working fine when we shut it off at night. The next morning when I turned it on, it was changing channels, going through all the channels over and over. That's when I turned it of, then held the source and menu buttons on the side of the TV while I turned it back on. That stopped the channel rolling. I suspect something in the TV is going bad.