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Hello, possibly the circuit board in the bottom right and also the touch pad may just need to be cleaned.
The rubber pad will become saturated in grease over time and can cause this issue. Try cleaning the rubber key pad first. If that doesn't work, replace the board on the bottom right of the machine. It's the only board besides the little touch pad board. I work on the honor system here at Just Answers. I'm not credited for my work until you rate my answer positively using the star rating system at the top of your page. Thanks