The membrane gets dirt under them and shorts out the keypad,you may as well just replace the control board which includes the display and keypad on the same board
SOURCE: My ge microwave wes1450dn1bb has
To COPTAB/ GE Microwave WES1450DN1BB
Mine too! I solved it, and hopefully you can too. I hit the clear/off button and held it down for several seconds with the door opened and closed. It cleared it up and it works again, hopefully forever.
Usually answered in minutes!