Lately (a week or two) I have been sporadically been noticing a lag with my MacBook Air keyboard. There is occasionally a noticeable hesitation between when I depress the key until the character appears on the screen. I do type around 50 to 60 wpm. And I have also been having wifi connectivity issues our apartment. Don't know that wifi would be a factor, but I mention it out of thoroughness. I have gone into settings; key repeat is about 2/3 the way to the right and repeat is also about 2/3 to the right. Was wondering if anyone had suggestions as to what is going on and/or how to cure it.