not working correctly

When the keyboard's been unused for some time, some of the keys stop working and i have to click on them (or any of these unworking keys) like 100 times and eventually they all at once continue to work again. Any solutions?

Hi everybody, I have a problem and I can't wrap my head around it. Sometimes the "t" "y" "o" Keys of my asus laptop don't work. what I mean is that sometime I press those keys and noting gets registered. I have to press them 3 or 4 times or even keep pressing them before the letter gets printed...

So this little problem slowly started it started to mute the voice then play it and then mute and after that it started to stuff for example ''Hello how...*SRRRR* A...*mute* you'' and it stops but most of the time its quiet my current headset is Realtek ADX something and im running on windows 8.1