For some reason, both keys do not work for most of the time, but can suddenly start working again as if nothing happened. When both Shifts are pressed at the same time, I noticed that the G and H keys are connected to 6 and 8 up on the numeric keys, and pressing G registers a 6, same for H and 8 and vice-versa. I have an Acer Aspire F15 F5-573G-519X