You may have a bad keypad, which in many cases can be replaced.
A bad keypad may be worn out due to age, damaged, or it may have gotten wet or otherwise contaminated.
Moisture and contamination can be caused by not using the fan when boiling on the stove top (for over the range models), direct spraying of cleaners, by storing the microwave in an unheated garage or shed, or infestation.
I warn my customers to never spray cleaner directly onto the microwave keypad, since the liquid can get inside and "lock up" or even ruin the keypad or controller.
You can find helpful exploded view diagrams and order parts by entering your model number here: http://tinyurl.com/gv383
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