Problem with key input (PC Keyboard)

I have a problem with a mechanical keyboard that it can randomly register only a key that was currently pressed and it will ignore any other inputs.

Example: Say that I'm pressing A and D rapidly in a game to move left and right. Sometimes, I would press D and it would only register D for 1-2 seconds and if I pressed A (or any other key) it would be simply ignored and the keyboard would still register only D, so I would only move right non-stop. This problem can happen on any key, not only D.

EDIT: Also, to add to the original post, I can't reproduce this issue as I don't know what is causing it. The only thing that I can say for sure is that it happens roughly once every 30 seconds, but in general it's spontaneous.