I have a problem with the mute symbol flashing on the left side of the television screen. This problem started approximately three months. The remote volume button will only move up or down approximately three levels, and it does not clear the mute symbol. After repeated attempts the volume would work correctly and clear the mute symbol. Now however the remote volume button is stuck to the three levels permanently. We changed the remote batteries, re-paired the remote with the television, unplugged the television and held the power button down to reboot the television, none of this has worked. The television is approximately two years old. The model number is: UN40MU6300. I appreciate any help you can give.