After the computer has been on for a long time or too many windows opened at once or something, causes the macbook pro to not recognize the F11 key to show the desktop. Reboot always fixes it 

Sometimes when I push a key, the first letter won't get recognized? Happens rarely, even though I'm tapping hard? I've seen this on other macbooks as well.

Sometimes when I push a key, the first letter won't get recognized? Happens rarely, even though I'm tapping hard? I've seen this on other macbooks as well.