I'm having a problem with my d70. My lenses have developed a little wiggle room. I get error messages on a regular basis, and have to rotate the lens to make proper connection. It happens with all four of my lenses... even with the 60mm micro, which fits very snugly. I've tried cleaning the contacts in the camera, but it hasn't made any difference. Have any of you encountered this problem, and how have you fixed it?