A Key On My Keyboad Keeps On Typing Automaticaly Logitech K120 Keyboard

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my Logitech K220 keyboard is automatically typing out “a” . I have already opened it dusted it a few times and it still it is no good . I hope someone helps , Thank you

Is the “a” key lower than any of the other keys? If not, make sure no dust has gotten in between the sheets of plastic used for the contacts.