I bought my laptop open box and since I have had issues with the keyboard. At first all keys were okay, then a month in the keys "G", "H" started to not register. It would take multiple presses at various pressures to register the input. Today it seems to have spread to other keys? Keys "I", the " key (hard to type these quotes in this post), "K", and the number "7" specifically only on my numpad. Has anyone had this issue before? The keys mentioned also, when they do register an input have key chatter. Does anyone have any idea on causes and possible fixes?