Why do some keys on my macbook crackle?

Question

Keyboard

Macbook is only 2 months old, model: Macbook Pro Retina 15 ssd latest version. Already managed to visit the service center, tk. when turned on, it made a strange sound. I bought it in Russia at cstore, now I’m in Thailand for a long time, so I had to contact their service center, it turned out that there were problems with the cooler, they ordered a new one, they gave the macbook for now, they said they would call, in a week somewhere, when they brought it a cooler or some part from it and will insert it within an hour.
But after the service center, although the problem may have existed before, I began to notice that some keys on the MacBook keyboard, when pressed, emit a slight unpleasant crunch periodically, not often, sometimes I specifically press them and everything is fine, but sometimes it crunches, It didn't seem like there was a problem like this before.
What could be the reason for this, please tell me, otherwise it is very annoying, to be honest!
ps. I don’t eat at a laptop, so the option with crumbs is unlikely

Answer 1

I had a similar problem on an old acer laptop. Due to heating in direct sunlight for 12 hours, the metal plate under the keyboard was deformed. There was a noticeable move when pressing the keys and a barely perceptible crunch of plastic.
Considering that you have a premium segment laptop, it is better to give it to a service center for a complete replacement.

Answer 2

It is necessary to pour out any dust, debris, etc. from under the keys. All sorts of crap accumulates there in kilograms, especially if you carry it in a bag.

Answer 3

no need to eat at the computer :)

Answer 4

Alternatively, the keys are not completely in their grooves. Push a little harder, but not too hard... and they will return to their original position. On my laptop it was