Over the years that I and some of my colleagues have had KN7000 keyboards, I have watched some of them bunging the SD Card hamfistedly into the slot and later wrenching it out again without pushing it down gently to make it pop up. Now Ray I'm not for one minute suggesting that you are in this category of human being but I think the SD slot is a rather delicate mechanism and needs treating with respect failing which it's bound to become possibly iretrievably damaged...just my thoughts.
Rog