The SD card needs to be pushed in all the way until it clicks and is held in. If you didn't do that, the door will hold the card in, and this will push the door out slightly so it can move. When that happens the card can become unstable. Go to settings and de-mount your card, remove the door, push the card in with the door removal device until it clicks, replace the door and it should now fit flush with the side and not feel springy. That should take care of the problem.