Your touch panel is likely experiencing a failure. You may need to replace the control panel but there is a trick you can try first. Turn off the power to the appliance. Use a hair dryer to heat the panel up until very warm while rubbing firmly over the buttons. Often times, this will restore operation. Be sure to get the panel very warm but not hot enough to damage the plastic. If this does not work, the panel will probably need to be replaced. Let me know what happens and I can get you the correct part information.