The keys on the mechanical keyboard do not work intermittently. Is it dust in the case or are the switches dying?

Question

Electronics

Mechanical keyboard, only 2 years old. Some keys intermittently do not work when pressed. At the same time, if you release the key that did not work, and press it again, then it works, even at halfway it works, as it should. The problem manifests itself periodically, approximately every 20th pressing of certain keys. What could it be? Dirt on the contacts inside the case? Switches are dying?
UPD: I took it apart, I thought to wipe the contacts, but the legs of the switches are soldered to the board. It turns out, switches die?

Answer 1

The problem is inside the switches, you need to solder them to new ones ...

Answer 2

The most accurate and short answer is dust. If you are not "Hand-ass", then you can wipe the board;)