This is because the buttons on the TV are not used for a long time, which leads to the leakage of the buttons. You can press the button on the TV several times after turning off the TV and try it several times more. If not, you can only ask maintenance personnel to repair and replace the buttons. Nowadays, TVs use dark current detection circuits. If you don't use the buttons on the TV for a long time, it will lead to the leakage of electricity due to moisture, which will cause the failure phenomenon you mentioned.