Square button just stop working

My controller is working then all of a sudden the square button just won’t work again. Then I turned on and off the system and reset the controller because no buttons were working for me to play the games. Which is odd because those same buttons allowed me to navigate my way to turn the system on and off and to select x button to get out of a game. After restarting and resetting the controller it works again. But NOT the square button. How can I fix this issue?