Hardware :: Characters Missing While Typing

I am trying to see if anyone else has this problem. I am a two finger typer, but type fairly fast. I write a lot on my computer, every day. Generally, I look at the keyboard when typing. I also tend to type hard, but this issue is there even when I try to type softer.

My problem is that I'll type a paragraph and then look up to proof my text and a significant number of characters are missing. This has continued with three different systems and multiple keyboards (wired and wireless). Apparently, the problem is me, but I am still fascinated by this matter.

I spent a tremendous amount of wasted time adding characters that are missing. Given I type with two fingers, AND I stare at the keyboard, I cannot fathom how so many characters do not appear.

So far on this posting, I have had to add five missing characters. Just imagine how many corrections I have to make in a year. This single problem must cost me days of wasted time.

If you have any suggestions, I am open to anything. I have even thought of filming my typing to assure I hit each key, but could not get a good camera angle. I would need to use at least two cameras.