That’s just silly, this behavior would have nothing to do with a dirty keyboard or the person using it, and you shouldn’t give advice like that if you don’t know what you’re talking about.
Nothing silly about what I said.
I’ve encountered the same problems as the original poster, on my machines and on other people’s machines.
In all cases, it came down to hardware problems or dirty keyboard, or driver problems.
The OS was NEVER the problem. Not that it couldn’t happen, but, not that I’ve encountered or heard or read about, other than the member above.