Certain laptop keys not working

I have a Lenovo Y520 gaming laptop. On the keyboard, there are certain keys not working correctly. Most of the time, these are 6, 7, y, u, h, j, n, and m keys that create problems. If you notice where the keys are on the keyboard, they make a diagonal-ish line. I'm not sure if that's important at all.

To make the keys (temporarily) work again. I have to hold the keys down util they start working again. This cold take a second to a few minutes. So typing paragraphs like this takes a long time.

I've already tried cleaning the keys but that doesn't work. I am not sure what else to do!

Help is appreciated!