"Some keys"?
If they are the keys representing letters most commonly typed then it could be a sign of some failing. E.g., E, T, N, O, R, I, A, & S per one source.
Otherwise check and slow the repeat speed. I.e., require the keys to be pressed longer before auto-repeating.
And some cleaning could help. With the computer off, spread a couple of paper towels out on your work surface. Turn the keyboard upside down and tap gently but firmly on ends and sides using the heel of your hand. The paper towels will catch all of the debris that falls out. Shake and repeat.