A:AnswerVery easy to fix: remove the cas. Without the phone, there is space for pressing them deeply and strech the rubber on that area a bit like 10-20 times, worked right away. I had the case for 2 weeks and had not improved at all until i did this. It is not necessary to use a blade.
A:AnswerLittle bit of both on the case the backing and corners are more of a harder plastic type and around the screen and buttons its a more soft rubber.