I have the 2019 Kahootz remake, and my keypad also started acting up. The wrong letters would be triggered on some keys, for example. I stuck a screwdriver under the top edge and used a plastic card around the edge to lift up the keypad. It is stuck to the plastic case with a light adhesive. I reseated the keypad and the problem went away. (I had first tried opening the case and cleaning the contacts from the keypad connector and tightening the 3 screws that hold it in place but that didn't help.)