I had a problem with the keyboard on my Asus Vivabook laptop. In the beginning it was fine. Over time, well-used keys became harder and harder to get work. Eventually, about 10 keys stopped getting any input at all or once pressed would get stuck down flooding the USB bus with extra keystrokes. Because changing a new keyboard was $90 parts + $100 labor (lots of labor to get to the keyboards in thin laptops), and the laptop was only worth about $150, if the keyboard was working perfectly, I decided to just retire it. I did try using it as a desktop with an external USB keyboard, but the extra, random, keystrokes that would just show up made it useless. Disconnecting the internal keyboard connector prevented it from booting at all. Nothing else wrong with the laptop.
After buying 3 laptops made with crappy keyboards from 2012 until 2017, I finally decided to stop that and picked up a Dell laptop in July. Dell tests their keyboard designs for over 1M presses per key. Of course, they also try to manufacture them as cheaply as possible, so they do break, just hopefully years after we've decided to get a new laptop.
None of this is probably helpful ... except maybe you could connect an external USB keyboard and see if that shows the same problem? That would rule out hardware if it happens there too. It would not be the keyboard hardware then.
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