Do you have a K3? If so, the inside of the cover where it comes into contact with the screen is smooth and level. I'm not too sure what you mean by the 'top fixing' for the cover. Do you mean the hinge? I haven't heard of the hinges affecting the screen that way - if it was damaging the screen I would expect you to have the problem all the time and not just when going from the Home Screen. If you speak to CS again though, it might be worth mentioning that you've used the same cover - there were some problems with the original unlighted cover causing freezing and rebooting problems and they may try replacing the cover for you. Can you try it out of the cover, or using your wife's cover, as an experiment?