You know how you hold down the "down" key and it scrolls down on a page? mine just suddenly quit doing that.. i held down "down" key and it only scrolls like 1cm (you know what i mean).. and as i was typing, it would miss out letters if i were to type"qwertyuiop" normally, it would type "qwtyp".. something like that.. did a restart and problem was gone.. why did that happen and how can i prevent it? or is it time to do a refund / return/ exchange? this is the 1st time it happened.. thanks
LAPTOP: HP PROBOOK 4530s